plunge in

phrasal verb·1 sense·particle in

Meanings

1

Embark suddenly and fully

Beginninguncommon

Why “in”? Entering the activity. In shows the moment you start doing something.

He plunged in and signed the contract that afternoon.
He decided quickly and signed the contract that afternoon.
She plunged in and opened her own shop.
She committed herself fully and opened her own shop.

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He plunged in and signed the contract that afternoon. What does it mean?

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