PLUMB LINE


Meaning of PLUMB LINE in English

[plumb line] n (15c) 1: a line (as of cord) that has at one end a weight (as a plumb bob) and is used esp. to determine verticality

2: a line directed to the center of gravity of the earth: a vertical line

Merriam-Webster English vocab.      Английский словарь Merriam Webster.