(now usually nautical) An English unit of length for water depth notionally based upon the width of grown man's outstretched arms but standardized as 6 feet (about 1.8 m).
Various similar units in other systems.
Depth of insight, mental reach or scope.
To encircle with outstretched arms, especially to take a measurement; to embrace.
To measure the depth of, take a sounding of.
To get to the bottom of; to manage to comprehend; understand (a problem etc.). Example: I can't for the life of me fathom what this means.
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