下さげ振ふり

noun

plumb bob; plummet

A weight suspended from a string, used to establish a vertical reference line in construction and surveying.

• 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下さげ振ふりを使つかった。

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