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1. Literally, to dive into or immerse oneself in a mass of something, typically a body of water. He plunged in the river to find relief from the heat. Having dropped my keys into the lake, I had no option but to plunge in to get them back.
2. By extension, to immerse oneself in or become consumed by some activity. We knew we had a lot of work to do to salvage the project, so we didn't waste any time and plunged right in.
3. To immerse someone or something into some mass of something or body of liquid. In this usage, a noun or pronoun can be used between "plunge" and "in." You have to plunge the fabric in the solution to help soften its fibers. The preacher plunged in the child as part of his river baptism.
4. To push or thrust an object deeply into something. In this usage, a noun or pronoun can be used between "plunge" and "in." The workers set about plunging iron rods in the wet concrete. The villain laughed cruelly at his victim before plunging in the knife.
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.