fathom ˈfað(ə)m/Submit noun 1. a unit of length equal to six feet (1.8 metres), chiefly used in reference to the depth of water. "sonar says that we're in eighteen fathoms"
fathom
ˈfað(ə)m/Submit
noun
1.
a unit of length equal to six feet (1.8 metres), chiefly used in reference to the depth of water.
"sonar says that we're in eighteen fathoms"