fathom Definition in Cambridge British English Dictionary
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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 years people 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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