Definition of fathom noun from the Oxford Advanced Learner's Dictionary

 

fathom

 noun
noun
BrE BrE//ˈfæðəm//
 
; NAmE NAmE//ˈfæðəm//
 
 
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a unit for measuring the depth of water, equal to 6 feet or 1.8 metres The ship sank in 20 fathoms. (figurative) She kept her feelings hidden fathoms deep. Word Origin Old English fæthm, of Germanic origin; related to Dutch vadem, vaam and German Faden ‘six feet’. The original sense was ‘something which embraces’, (plural) ‘the outstretched arms’; hence, a unit of measurement based on the span of the outstretched arms, later standardized to six feet.
See the Oxford Advanced American Dictionary entry: fathom

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