(third-person singular simple present fathoms, present participle fathoming, simple past and past participle fathomed)
- (archaic) To encircle with outstretched arms, especially to take a measurement; to embrace.
- To measure the depth of, take a sounding of.
- (figuratively) To get to the bottom of; to manage to comprehend (a problem etc.).
- I can't for the life of me fathom what this means.
From Middle English fathome, fadome, from Old English fæþm, fæþme (“outstretched or encircling arms, embrace, grasp, protection, interior, bosom, lap, breast, womb, fathom, cubit, power, expanse, surface”), from Proto-Germanic *faþmaz (“embrace”), from Proto-Indo-European *pet- (“to spread out, extend”). Cognate with Low German fadem, faem (“a cubit, thread”), Dutch vadem, vaam (“fathom”), German Faden (“thread, filament, fathom”), Danish favn (“embrace, fathom”), Swedish famn (“the arms, bosom, embrace”), Icelandic faðmur (“embrace”).