- plunge
- 1
verb
1 (intransitive, transitive always + adv/prep) to move, fall, or be thrown suddenly forwards or downwards(+ off/into etc): Her car swerved and plunged off the cliff. | plunge to your death: The rope broke and both the climbers plunged feet to their death. | plunge sb/sth forward/through etc: The car stopped suddenly and he was plunged forward through the windshield.2 (I) if a price, value, or rate plunges it suddenly goes down by a large amount: The price of oil has plunged to a new low.3 (I) if a ship plunges, it moves violently up and down, usually because of high wavesplunge in phrasal verb (I) to start talking, doing something etc quickly and confidently, without worrying: Zoe plunged in and started chatting happily. plunge into phrasal verb (T)1 plunge sth into sth to push something firmly and deeply into something else: Plunge the asparagus into boiling water. | Jill plunged her hands deep into her pockets.2 plunge sb/sth into sth to make someone or something experience a particular type of situation, especially one that is difficult or unpleasant: This latest scandal has plunged the Administration into controversy. | The hall was suddenly plunged into darkness. | be plunged into gloom/despair etc (=suddenly experience great unhappiness): The whole regiment was plunged into despair by this news.3 plunge into sth to begin to do something suddenly, without thinking about the possible results: Stuart was always plunging into risky ventures.2 noun1 take the plunge to decide finally to do something, especially after delaying it or worrying about it for a long time: In 1990 Pam took the plunge and set up her own business.2 DOWNWARD MOVEMENT (countable usually singular) a sudden quick downward movement: Without warning, the plane began a plunge towards the Earth.3 INTO WATER (countable usually singular) a dive 2 (1) or jump into water, or a quick swim: Sue felt refreshed after a quick plunge in the lake.4 DECREASE (C) a sudden large fall in the value of property, share 2 (5) s etc: a dramatic plunge in house prices
Longman dictionary of contemporary English. 2004.