One of the mysteries of the English language finally explained.
1‘Charlie tried to fathom the expression on his friend's face’
understand, comprehend, work out, fathom out, make sense of, grasp, catch, follow, perceive, make out, penetrate, divine, search out, ferret out, puzzle out, take in, assimilate, absorb, get to the bottom of
interpret, decipher, decode, disentangle, untangle, unravel, piece together
informal make head or tail of, take on board, get a fix on, catch the drift of, get the drift of, tumble to, crack, dig, get, get the picture, get the message, see what's what
British informal twig, suss, suss out
North American informal savvy
2‘an attempt to fathom the ocean’
measure the depth of, sound, plumb, probe
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