Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: plongier, from Vulgar Latin plumbicare, from Latin plumbum 'lead'

plunge

1 verb
     
plunge1
1 [intransitive,transitive always + adverb/preposition] to move, fall, or be thrown suddenly forwards or downwards
plunge off/into etc
Her car swerved and plunged off the cliff.
Both the climbers had plunged to their deaths.
2 [intransitive] if a price, rate etc plunges, it suddenly decreases by a large amount:
The unemployment rate plunged sharply.
In the recession, the company's profits plunged 60%.
3 [intransitive] literary if a ship plunges, it moves violently up and down because of big waves

plunge in

phrasal verb
1 to start talking or doing something quickly and confidently, especially without thinking about it first:
It's a difficult situation. You can't just plunge in and put everything right.
'I don't agree,' she said, plunging into the conversation.
2 to jump or dive into water:
He stripped off and plunged into the sea.
3

plunge something ↔ in

also plunge something into something to push something firmly and deeply into something else:
He open the bag and plunged his hand in.
Plunge the pasta into boiling water.
Repeatedly she plunged the knife into his chest.

plunge (somebody/something) into something

phrasal verb
to suddenly experience a difficult or unpleasant situation, or to make someone or something do this:
A strike would plunge the country into chaos.
The house was suddenly plunged into darkness.
After the war, the family plunged into debt.

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