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plunge

2 noun
     
plunge2
1

take the plunge

to decide to do something important or risky, especially after thinking about it for a long time:
We took the plunge and set up our own business.
2 [countable] a sudden large decrease in the price, value etc of something
plunge in
a dramatic plunge in house prices
3 [countable usually singular] a sudden movement down or forwards:
The plane began a headlong plunge towards the Earth.
4 [countable usually singular] when someone suddenly becomes involved in something new
plunge into
his sudden plunge into marriage
5 [countable usually singular] a jump or dive into water, or a quick swim
plunge in/into
a quick plunge in the lake

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