Longman Dictionary of Contemporary English homepage

fathom

2 verb
     
fathom2 also fathom out [transitive]
to understand what something means after thinking about it carefully [= work out]:
I still can't fathom out what she meant.
fathom how/why/where etc
Mark couldn't fathom why she resented him so much.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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