fathom

/ˈfæðəm/

noun

Grasp, envelopment, control.
(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).
Similar: brace, orguia, stade
Various similar units in other systems.

verb

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.).
"I can't for the life of me fathom what this means."
Similar: fathom out, figure out, puzzle out, work out

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