To finally do something risky after waiting a long time.
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To finally do something risky after hesitating for a long time.
When you take the plunge, you stop weighing the decision and commit — quitting a job, moving abroad, getting married.
It carries the sense that the hard part was deciding, not doing.
"Test the Waters"
—
Try cautiously before committing
"Bite the Bullet"
—
Accept something unpleasant you cannot avoid
"Take the Plunge"
—
Commit after long hesitation