n a linear unit of measurement (equal to 6 feet) for water depth
n (mining) a unit of volume (equal to 6 cubic feet) used in measuring bodies of ore
v come to understand
v measure the depth of (a body of water) with a sounding line
n. 英寻( fathom的名词复数 )
v. 理解…的真意( fathom的第三人称单数 ); 彻底了解; 弄清真相