释义 |
plumb line 1 ENTRIES FOUND: plumb line (noun) plumb line noun plural plumb lines plumb line noun plural plumb lines Learner's definition of PLUMB LINE [count] : a tool that consists of a small, heavy object attached to a string or rope and that is used especially to see if something (such as a wall) is perfectly vertical铅垂线 — called also (US) plumb bob |