plummet

Noun
  1. is a type of: bob - a hanging weight, especially a metal ball on a string
    is a part of: perpendicular, plumb line - a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point
    same as: plumb, plumb bob
Verb
  1. is a type of: drop - to fall vertically
    same as: plump

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