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English definition of “fathom”

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fathom

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

fathom

verb [T] uk   /ˈfæð.əm/ us  
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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