definition of
fathom

[1] #1 fathom v. [penetrate, bottom] come to understand. wn

[2] #2 fathom n. [fthm] a linear unit of measurement (equal to 6 feet) for water depth. wn

[3] #3 fathom n. [fthm] (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore. wn

[4] #4 fathom v. [sound] measure the depth of (a body of water) with a sounding line. wn