fathom (fathoms plural & 3rd person present) (fathoming present participle) (fathomed past tense & past participle )
1 n-count A fathom is a measurement of 1.8 metres or 6 feet, used when referring to the depth of water.
oft num N
We sailed into the bay and dropped anchor in five fathoms of water.
2 verb If you cannot fathom something, you are unable to understand it, although you think carefully about it.
no cont, oft with brd-neg
I really couldn't fathom what Steiner was talking about... V wh
Jeremy's passive attitude was hard to fathom. V n
Fathom out means the same as fathom., phrasal verb
We're trying to fathom out what's going on... V P wh
I'm having difficulty using my video editing equipment and can't fathom out the various connections. V P n (not pron), Also V n P