Webster's English Dictionary

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plummet

1. plum.met \'pl*m-*t\ n [ME plomet, fr. MF plombet ball of lead, fr. plomb 
   lead, fr.](assumed) OF - more at PLUMB : PLUMB BOB; also : a plumb line 
2. plummet vi 1: to fall perpendicularly  2: to drop sharply and abruptly