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plunge (something) in(to) (someone or something)
To force the full length of something into a person or something else. The workers set about plunging iron rods into the wet concrete. He laughed cruelly before plunging the knife into the woman's back.
plunge into (something)
1. Literally, to dive into or immerse oneself in a mass of something, typically a body of water. He plunged into the river to try and save his little brother. The detective plunged into the crowd of people in pursuit of the criminal.
2. By extension, to immerse oneself in or become consumed by some activity. The new team plunged into the project, hoping to salvage the work that had already been done. The detective plunged into the crowd of people in pursuit of the criminal.
plunge in(to something)
to dive or rush into something; to immerse oneself in something. Ned took off his shoes and plunged into the river, hoping to rescue Frank. He plunged into his work and lost track of time.
1. To submerge something quickly into something else: The cook plunged the hot eggs in the cold water to stop them from cooking.
2. To jump or throw oneself into something: I walked up to the swimming pool and plunged in.
3. To fall into something: The child slipped and plunged in the well.