Able to be understood, measured, or comprehended; capable of being fathomed out or solved.
Adjective form of 'fathom' created by adding the suffix '-able' (meaning capable of being). 'Fathom' as a verb means both to measure depth and to understand or figure something out.
The shift from 'fathom' meaning to physically measure depth to meaning 'to understand' shows how we use physical acts as metaphors for mental ones—you 'grasp,' 'reach,' and 'fathom' ideas just like objects.
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