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plunge2
1 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.
take the plunge
We took the plunge and set up our own business.2 [countable] a sudden large decrease in the price, value etc of something
3 [countable usually singular] a sudden movement down or forwards :
4 [countable usually singular] when someone suddenly becomes involved in something new
5 [countable usually singular] a jump or dive into water, or a quick swim
