n. 1. See plumb bob. 2. Something that weighs down or oppresses; a burden. intr.v. plum·met·ed, plum·met·ing, plum·mets 1. To fall straight down; plunge. 2. To decline suddenly and steeply: Stock prices plummeted. [Middle English plomet, from Old French, ball of lead, diminutive of plom, plomb, sounding lead, from Latin plumbum.] |
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