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fathom

fathom

10 6.5
A unit of length equal to six feet used to measure water depth
  • noun
  • /ˈfæðəm/
  • Specialized
: braza
  • We're down to 60 fathoms of line left, sir!
  • depth in fathoms
  • 4-fathom
  • 100 fathoms

Examples

Idioms

To understand how serious or important something is

Compounds

square fathom
  • Archaic
9.1

An area the size of a square six feet on each side

How Long

fathom
  • Specialized
10 6.5
ell
  • Archaic
9.9
yard
∞ 1.0
foot
∞ 1.0
inch
∞ 1.0

Surface Forms

fathom singular
fathoms plural

Etymology

The word fathom comes from an old English word fæðm meaning 'outstretched arms' or 'embrace'. Sailors used the distance of a man's arm span to measure depth, so a fathom became a unit of about six feet for water depth.