1. measure the depth of (a body of water) with a sounding line

    Synonyms : sound
    Type Of : measure, quantify
  2. a linear unit of measurement (equal to 6 feet) for water depth

    Synonyms : fthm
    Type Of : linear measure, linear unit
  3. (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore

    Synonyms : fthm
    Type Of : cubage unit, volume unit, capacity unit, cubic measure, capacity measure, displacement unit, cubic content unit, cubature unit
  4. come to understand

    Synonyms : bottom, penetrate
    Type Of : understand