Definition of “fathom” - English Dictionary

(Definition of “fathom” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“fathom” in American English

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fathomnoun [ C ]

us /ˈfæð·əm/

fathom noun [ C ] (MEASUREMENT)

a unit of measurement of the depth of water equal to 6 feet or 1.8 meters

fathomverb [ T ]

us /ˈfæð·əm/

fathom verb [ T ] (UNDERSTAND)

to discover the meaning of something:

I just couldn’t fathom what he was talking about.

(Definition of “fathom” from the Cambridge Academic Content Dictionary © Cambridge University Press)