名詞 plummet:

1. the metal bob of a plumb line
   同義詞：plumb bob, plumb

動詞 plummet:

1. drop sharply
   同義詞：plump

1. Share price plummet or plunge on the news of the devaluation.
   一有貶值的消息，股票價格就暴跌了。
2. Pieces of rock plummeted down the mountainside to the ground below.
   巖石一塊塊順著山的陡坡滾落到地面。
3. House prices have plummeted in this area.
   此地房價大跌。

plum.met

n.（名詞）
A plumb bob.
鉛錘
Something that weighs down or oppresses; a burden.
壓抑物，壓迫感：壓下來或壓迫的事物；負擔
v.intr.（不及物動詞）
plum.met.ed,plum.met.ing,plum.mets
To fall straight down; plunge.
垂直落下：垂直落下來；一頭扎下
To decline suddenly and steeply:
驟降，爆跌：突然和大幅度地降低：
例句：
Stock prices plummeted.
股票價格暴跌

來源：
Middle English plomet
中古英語 plomet
from Old French [ball of lead] [diminutive of] plom, plomb [sounding lead]
源自 古法語 [鉛球] [] plom, plomb的小后綴 [測深鉛錘]
from Latin plumbum
源自 拉丁語 plumbum