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ground  (grounds plural & 3rd person present) (grounding present participle) (grounded past tense & past participle )
1  n-sing The ground is the surface of the earth. 
the N 
Forty or fifty women were sitting cross-legged on the ground..., We slid down the roof and dropped to the ground.  Something that is below ground is under the earth's surface or under a building. Something that is above ground is on top of the earth's surface. 
above ground/below ground  phrase 
People were making for the air-raid shelters below ground.  
2  n-sing If you say that something takes place  on the ground, you mean it takes place on the surface of the earth and not in the air. 
oft N n 
Coordinating airline traffic on the ground is as complicated as managing the traffic in the air.  
3  n-sing The ground is the soil and rock on the earth's surface. 
usu the N 
The ground had eroded., ...the marshy ground of the river delta.  
4  n-uncount You can refer to land as ground, especially when it has very few buildings or when it is considered to be special in some way. 
usu with supp 
...a stretch of waste ground..., This memorial stands on sacred ground.  
5  n-count You can use ground to refer to an area of land, sea, or air which is used for a particular activity. 
supp N 
...Indian hunting grounds..., The best fishing grounds are around the islands.  
6  n-count A ground is an area of land which is specially designed and made for playing sport or for some other activity. In American English grounds is also used. 
supp N 
...the city's football ground., ...a parade ground.  
7  n-plural The grounds of a large or important building are the garden or area of land which surrounds it. 
usu with supp, oft N of n, n N 
...the palace grounds., ...the grounds of the University.  
8  n-var You can use ground to refer to a place or situation in which particular methods or ideas can develop and be successful. 
with supp, oft N for n 
The company has maintained its reputation as the developing ground for new techniques..., Colonialism is especially fertile ground for nationalist ideas.  
9  n-uncount You can use ground in expressions such as on shaky ground and the same ground to refer to a particular subject, area of experience, or basis for an argument. 
supp N, oft on adj N 
Sensing she was on shaky ground, Marie changed the subject..., The French are on solid ground when they argue that competitiveness is no reason for devaluation..., It's often necessary to go over the same ground more than once.  
10  n-uncount Ground is used in expressions such as gain ground, lose ground, and give ground in order to indicate that someone gets or loses an advantage.  (JOURNALISM) 
There are signs that the party is gaining ground in the latest polls..., The US dollar lost more ground.  
11  n-var If something is grounds for a feeling or action, it is a reason for it. If you do something on the grounds of a particular thing, that thing is the reason for your action. 
N for n, on N with supp 
In the interview he gave some grounds for optimism..., The court overturned that decision on the grounds that the Prosecution had withheld crucial evidence..., Owen was against it, on the grounds of expense.  
12  verb If an argument, belief, or opinion is grounded in something, that thing is used to justify it.  (=base) 
Her argument was grounded in fact...  be V-ed in/on n 
They believe the soul is immortal, grounding this belief on the Divine nature of the human spirit.  V n in/on n 
13  verb If an aircraft or its passengers are grounded, they are made to stay on the ground and are not allowed to take off. 
The civil aviation minister ordered all the planes to be grounded...  be V-ed 
A hydrogen leak forced NASA to ground the space shuttle.  V n 
14  verb When parents ground a child, they forbid them to go out and enjoy themselves for a period of time, as a punishment. 
Thompson grounded him for a month, and banned television.  V n 
15  verb If a ship or boat is grounded or if it grounds, it touches the bottom of the sea, lake, or river it is on, and is unable to move off. 
Residents have been told to stay away from the region where the ship was grounded...  be V-ed 
The boat finally grounded on a soft, underwater bank.  V 
...a grounded oil tanker.  V-ed 
16  n-count The ground in an electric plug or piece of electrical equipment is the wire through which electricity passes into the ground and which makes the equipment safe. 
 (AM) usu sing 
in BRIT, use  earth  
17  adj Ground meat has been cut into very small pieces in a machine. 
 (mainly AM) 
...ground beef., ...The sausages are made of coarsely ground pork.  
in BRIT, usually use  minced  
18 Ground is the past tense and past participle of  grind. 
19 
  grounding 
  home ground 
20 If you break new ground, you do something completely different or you do something in a completely different way. 
break new ground  phrase V inflects  (approval)  Gellhorn may have broken new ground when she filed her first report on the Spanish Civil War.  
21 If you say that a town or building is burnt to the ground or is razed to the ground, you are emphasizing that it has been completely destroyed by fire. 
burn sth to the ground/raze sth to the ground  phrase V inflects  (emphasis)  The town was razed to the ground after the French Revolution.  
22 If two people or groups find common ground, they agree about something, especially when they do not agree about other things. 
common ground  phrase 
23 If you go to ground, you hide somewhere where you cannot easily be found. 
 (BRIT) 
go to ground  phrase V inflects 
Citizens of East Beirut went to ground in basements and shelters.  
24 The middle ground between two groups, ideas, or plans involves things which do not belong to either of these groups, ideas, or plans but have elements of each, often in a less extreme form. 
middle ground  phrase oft PHR between n 
She seems to have found a middle ground in which mutual support, rather than complete dependency, is possible.  
25 If something such as a project gets off the ground, it begins or starts functioning. 
off the ground  phrase PHR after v, v-link PHR 
We help small companies to get off the ground.  
26 If you prepare the ground for a future event, course of action, or development, you make it easier for it to happen. 
prepare the ground  phrase V inflects 
...a political initiative which would prepare the ground for war.  
27 If you shift your ground or change your ground, you change the basis on which you are arguing. 
shift one's ground/change one's ground  phrase V inflects 
28 If you stand your ground or hold your ground, you continue to support a particular argument or to have a particular opinion when other people are opposing you or trying to make you change your mind. 
stand one's ground/hold one's ground    phrase V inflects 
The spectacle of Sakharov standing his ground and speaking his mind gave me hope.  
29 If you stand your ground or hold your ground, you do not run away from a situation, but face it bravely. 
stand one's ground/hold one's ground  phrase V inflects 
She had to force herself to stand her ground when she heard someone approaching.  
30 If you say that something such as a job or piece of clothing suits someone down to the ground, you mean that it is completely suitable or right for them. 
 (BRIT) 
INFORMAL 
suit sb down to the ground  phrase V inflects  (emphasis)  
31 If people or things of a particular kind are thin on the ground, there are very few of them. 
 (mainly BRIT) 
thin on the ground  phrase v-link PHR 
Good managers are often thin on the ground.  
32 
  to have  one's ear to the ground 
  ear 

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"