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To commit oneself boldly to a decisive, momentous, or risky course of action after hesitation.
"After years of daydreaming, they finally took the plunge and started their own bakery."
"He had been contemplating proposing for months before taking the plunge."
Individual vocabulary building blocks comprising this expression
Derived from diving or plunging into cold, deep water after hesitating on the edge of the dock or diving board.
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