Meaning of “take the plunge” in the English Dictionary

british dictionary

"take the plunge" in British English

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take the plunge

C2 to make a decision to do something, especially after thinking about it for a long time:

They're finally taking the plunge and getting married.

(Definition of “take the plunge” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"take the plunge" in American English

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take the plunge

to decide to do something, esp. after thinking about it for a long time:

They took the plunge and got married last month.

(Definition of “take the plunge” from the Cambridge Academic Content Dictionary © Cambridge University Press)