2 noun

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

Dictionary results for "plunge"
Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.