鉛えん錘すい

noun

plumb bob

A weight, usually of lead, suspended from a line and used to establish a vertical reference line.

• 大だい工くは壁かべが垂すい直ちょくかどうかを確たしかめるために鉛えん錘すいを使つかった。

  The carpenter used a plumb bob to check whether the wall was vertical.