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plunge (something) in(to) (something)
To push an object deeply into something. The workers set about plunging iron rods into the wet concrete. The villain laughed cruelly before plunging the knife into the victim's back.
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.