fathom Definition in the Cambridge English Dictionary
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Definition of “fathom” - English Dictionary

Definition of "fathom" - American English Dictionary

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fathomnoun [C]

 us   /ˈfæð·əm/

fathom noun [C] (MEASUREMENT)

a ​unit of ​measurement of the ​depth of ​waterequal 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)

Definition of "fathom" - British English Dictionary

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fathomnoun [C]

uk   us   /ˈfæð.əm/
a ​unit for ​measuring the ​depth of ​water, ​equal to 1.8 ​metres or 6 ​feet

fathomverb [T]

uk   us   /ˈfæð.əm/
UK to ​discover the ​meaning of something: For ​yearspeople have been ​trying to fathom (out) the ​mysteries of the whale's ​song. to ​understand someone or why someone ​acts as they do: I can't fathom her at all.
(Definition of fathom from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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