back emf definition, back emf meaning | English dictionary

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back emf  


      n     (Electrical engineering)   an electromagnetic force appearing in an inductive circuit in such a direction as to oppose any change of current in the circuit  
English Collins Dictionary - English Definition & Thesaurus  
Collins
back   [1]  
      n  
1    the posterior part of the human body, extending from the neck to the pelvis  
   Related adj       dorsal  
2    the corresponding or upper part of an animal  
3    the spinal column  
4    the part or side of an object opposite the front  
5    the part or side of anything less often seen or used  
the back of a carpet, the back of a knife     
6    the part or side of anything that is furthest from the front or from a spectator  
the back of the stage     
7    the convex part of something  
the back of a hill, the back of a ship     
8    something that supports, covers, or strengthens the rear of an object  
9      (Ball games)  
a    a mainly defensive player behind a forward  
b    the position of such a player  
10    the part of a book to which the pages are glued or that joins the covers  
11      (Mining)  
a    the side of a passage or layer nearest the surface  
b    the earth between that level and the next  
12    the upper surface of a joist, rafter, slate, tile, etc., when in position  
   Compare       bed       13  
13    at one's back   behind, esp. in support or pursuit  
14    at the back of one's mind   not in one's conscious thoughts  
15    behind one's back   without one's knowledge; secretly or deceitfully  
16    break one's back   to overwork or work very hard  
17    break the back of   to complete the greatest or hardest part of (a task)  
18    (flat) on one's back   incapacitated, esp. through illness  
19    get off someone's back  
Informal   to stop criticizing or pestering someone  
20    have on one's back   to be burdened with  
21    on someone's back  
Informal   criticizing or pestering someone  
22    put one's back into   to devote all one's strength to (a task)  
23    put (or get) someone's back up   to annoy someone  
24    see the back of   to be rid of  
25    back of beyond  
a    the. a very remote place  
b      (Austral)   in such a place (esp. in the phrase out back of beyond)  
26    turn one's back on  
a    to turn away from in anger or contempt  
b    to refuse to help; abandon  
27    with one's back to the wall   in a difficult or desperate situation  
      vb   mainly tr  
28    also intr   to move or cause to move backwards  
29    to provide support, money, or encouragement for (a person, enterprise, etc.)  
30    to bet on the success of  
to back a horse     
31    to provide with a back, backing, or lining  
32    to provide with a music accompaniment  
a soloist backed by an orchestra     
33    to provide a background for; be at the back of  
mountains back the town     
34    to countersign or endorse  
35    Archaic   to mount the back of  
36    intr; foll by: on or onto   to have the back facing (towards)  
the house backs onto a river     
37    intr   (of the wind) to change direction in an anticlockwise direction  
   Compare       veer   1       3a  
38      (Nautical)   to position (a sail) so that the wind presses on its opposite side  
39    back and fill  
a      (Nautical)   to manoeuvre the sails by alternately filling and emptying them of wind to navigate in a narrow place  
b    to vacillate in one's opinion  
      adj   prenominal  
40    situated behind  
a back lane     
41    of the past  
back issues of a magazine     
42    owing from an earlier date  
back rent     
43      (Chiefly U.S., Austral., and N.Z.)   remote  
back country     
44    (of a road) not direct  
45    moving in a backward direction  
back current     
46      (Phonetics)   of, relating to, or denoting a vowel articulated with the tongue retracted towards the soft palate, as for the vowels in English hard, fall, hot, full, fool  
      adv  
47    at, to, or towards the rear; away from something considered to be the front; backwards; behind  
48    in, to, or towards the original starting point, place, or condition  
to go back home, put the book back, my headache has come back     
49    in or into the past  
to look back on one's childhood     
50    in reply, repayment, or retaliation  
to hit someone back, pay back a debt, to answer back     
51    in check  
the dam holds back the water     
52    in concealment; in reserve  
to keep something back, to hold back information     
53    back and forth   to and fro  
54    back to front  
a    in reverse  
b    in disorder,   (See also)        back down       back off       back out       back up  
     (Old English bæc; related to Old Norse bak, Old Frisian bek, Old High German bah)  

English Collins Dictionary - English Definition & Thesaurus  

Collins

back  


      vb  
1    abet, advocate, assist, champion, countenance, encourage, endorse, espouse, favour, finance, promote, sanction, second, side with, sponsor, subsidize, support, sustain, underwrite  
2    back off, backtrack, go back, move back, regress, retire, retreat, reverse, turn tail, withdraw  
      n  
3    backside, end, far end, hind part, hindquarters, posterior, rear, reverse, stern, tail end  
      adj  
4    end, hind, hindmost, posterior, rear, tail  
5      (From an earlier time)   delayed, earlier, elapsed, former, overdue, past, previous  
6    behind one's back      covertly, deceitfully, secretly, sneakily, surreptitiously  
  
Antonyms     
,       vb  
1    attack, combat, hinder, thwart, undermine, weaken  
2    advance, approach, move forward, progress  
      n   face, fore, front, head  
      adj  
4    advance, fore, front  
5    future, late  


answer back     
argue, be cheeky, be impertinent, cheek     (informal)   contradict, disagree, dispute, rebut, retort, talk back  
back down     
accede, admit defeat, back-pedal, concede, give in, surrender, withdraw, yield  
back out     
abandon, cancel, chicken out     (informal)   cop out     (slang)   give up, go back on, recant, renege, resign, retreat, withdraw  
back up     
aid, assist, bolster, confirm, corroborate, reinforce, second, stand by, substantiate, support  
come back     
reappear, recur, re-enter, return  
cut back     
check, curb, decrease, downsize, draw or pull in one's horns     (informal)   economize, lessen, lower, prune, reduce, retrench, slash, trim  
double back     
backtrack, circle, dodge, loop, retrace one's steps, return, reverse  
draw back     
back off, recoil, retract, retreat, shrink, start back, withdraw  
fall back     
back off, draw back, recede, recoil, retire, retreat, withdraw  
fall back on     
call upon, employ, have recourse to, make use of, press into service, resort to  
fight back  
1    defend oneself, give tit for tat, hit back, put up a fight, reply, resist, retaliate  
2    bottle up, contain, control, curb, hold back, hold in check, restrain  
get back  
1    recoup, recover, regain, repossess, retrieve  
2    arrive home, come back or home, return, revert, revisit  
3      (with)       at   be avenged, get even with, get one's own back, give tit for tat, hit back, retaliate, settle the score with, take vengeance on  
go back  
1    retrocede, return, revert  
2    change one's mind, desert, forsake, renege, repudiate, retract  
hang back     
be backward, be reluctant, demur, hesitate, hold back, recoil  
hark back     
look back, recall, recollect, regress, remember, revert, think back  
hold back  
1    check, control, curb, inhibit, rein, repress, restrain, stem the flow, suppress  
2    desist, forbear, keep back, refuse, withhold  
keep back  
1    check, constrain, control, curb, delay, hold back, keep a tight rein on, limit, prohibit, restrain, restrict, retard, withhold  
2    censor, conceal, hide, keep dark, keep under one's hat, reserve, suppress, withhold  
laid-back     
at ease, casual, easy-going, easy-oasy     (slang)   free and easy, relaxed, together     (slang)   unflappable     (informal)   unhurried  
  
Antonyms     
   edgy, jittery     (informal)   jumpy, keyed-up, nervous, on edge, tense, twitchy     (informal)   uptight     (informal)   wound-up     (informal)  
pay back  
1    get even with     (informal)   get one's own back, hit back, reciprocate, recompense, retaliate, settle a score  
2    refund, reimburse, repay, return, settle up, square  
set back     
delay, hinder, hold up, impede, retard, slow  
take back  
1    disavow, disclaim, recant, renege, renounce, retract, unsay, withdraw  
2    get back, recapture, reclaim, reconquer, regain, repossess, retake  
3    accept back, exchange, give one a refund for  

English Collins Dictionary - English synonyms & Thesaurus  

Collaborative Dictionary     English Definition
exp.
adopt a detached attitude; relax
adv.
a lot; very much; in a great quantity; endlessly
[Fig.] E.g. love someone to the moon and back=love someone very much
exp.
(colloquially) tattoo on the lower back
exp.
acronym for Let Me Know, as to ask the other party to get back to you

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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"