1. (noun) fathom, fthm
a linear unit of measurement (equal to 6 feet) for water depth
Synonyms: fthm, fathom
2. (verb) fathom, fthm
(mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore
Synonyms: fthm, fathom
3. (verb) penetrate, fathom, bottom
come to understand
Synonyms: click, imbue, riddle, dawn, infiltrate, permeate, perforate, diffuse, sink in, penetrate, come home, get through, bottom, fall into place, fathom, sound, pervade, get across, interpenetrate
4. (verb) fathom, sound
measure the depth of (a body of water) with a sounding line
Synonyms: sound, vocalise, penetrate, voice, fathom, vocalize, bottom, go
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Synonyms and Antonyms of fathom 
