Fathom
/fˈæðəm/
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Definition
(noun) A man's armspan, generally reckoned to be six feet (about 1.8 metres). Later used to measure the depth of water, but now generally replaced by the metre outside American usage.
Sentence Examples
I can't fathom what you said.
I didn't fathom this happening.
CEFR Practice Quiz
I cannot ____ why she would leave such a great job without having another one lined up first.