take the plunge

Idioms & Phrases

take the plunge

Venture something, commit oneself, as in You've been living together for a year, so when are you going to take the plunge and get married? It is also put as make the plunge, plunge alluding to diving in a body of water. [Mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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