Definition of plummet in English:

plummet

Syllabification: plum·met
Pronunciation: /ˈpləmət
 
/

verb (plummets, plummeting, plummeted)

[no object]
1Fall or drop straight down at high speed: a climber was killed when he plummeted 300 feet down an icy gully
More example sentences
  • If he fell, he would plummet 60 feet straight down onto the jumble of boulders strewn at the base.
  • Without warning, he dropped straight down, plummeting toward the ground far below.
  • Requiring nerves of steel, speed sky diving involves plummeting from a plane at more than 300 mph.
Synonyms
1.1Decrease rapidly in value or amount: hardware sales plummeted
More example sentences
  • The sale was abruptly halted, the value of the painting plummeted and the they decided to sue.
  • She said she knew of people whose property values had plummeted, and others who had been deterred from moving to the area as a result of the threat.
  • She said the value of houses has plummeted so low landlords are able to buy property at rock bottom cost and then rent them out for profit.
Synonyms
fall steeply, plunge, tumble, drop rapidly, go down, slump
informal crash, nosedive

noun

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1A steep and rapid fall or drop.
More example sentences
  • His body was pushed back in the seat by the fall, the plummet sending his adrenaline running through his veins.
  • Somehow he has turned our headlong plummet into the sign of hope for the future.
  • The building began it's plummet, falling forward.
2A plumb or plumb line.
More example sentences
  • With a heavy plummet, I plumb the depth and set the float so that about half the float's length is protruding above the surface.
  • All we are going to do is put a plummet on and lower it in, tight to the margins, turn sideways to drop it right in at the edge of the vegetation.

Origin

late Middle English (as a noun): from Old French plommet 'small sounding lead', diminutive of plomb 'lead'. The current verb sense dates from the 1930s.

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