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
ზმნა
Universal
1 [usually with negative] understand (a difficult problem or an enigmatic person) after much thought:the locals could not fathom out the reason behind his new-found prosperity [with clause]:he couldn’t fathom why she was being so anxious
2measure the depth of (water):an attempt to fathom the ocean