Abbreviation for 'fathom'; a unit of measurement equal to six feet, used especially in water depth.
Abbreviation of 'fathom' (Old English 'fæðm,' arm's length). The 6-foot measurement came from average arm-spread measurements of sailors.
'Fathoms' connect human body measurement to ocean depths—your arm span literally became the standard for measuring how deep it is to the sea floor!
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