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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 find relief from the heat. The detective plunged into the crowd of people in pursuit of the suspect.
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.
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 into the solution to help soften its fibers. The preacher plunged the child into the river as part of the baptism ceremony.
4. To push or thrust an object deeply into something. In this usage, a noun or pronoun is used between "plunge" and "into." The workers set about plunging iron rods into the wet concrete. The villain laughed cruelly before plunging the knife into the victim's back.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
plunge something into someone or somethingand plunge something in
to drive or stab something into someone or something. The murderer plunged the knife into his victim. She plunged in the dagger.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
1. To fall or dive into some place or thing: I jumped off the diving board and plunged into the warm water.
2. To thrust or throw something forcefully into some place or thing: I plunged the shovel into the soil.
3. To enter earnestly or wholeheartedly into some activity or situation: After the vacation, I plunged into my studies with renewed energy.
4. To send someone or something into some condition or situation: My gambling losses plunged me into debt.
5. To fall into some state or condition: After my divorce, I plunged into a deep depression.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.