plunge (something) in(to) (someone or something)

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.
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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.
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plunge something into someone or something

 and 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.
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plunge in

v.
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.
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plunge into

v.
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.
See also: plunge