Take plunge


verb (used with object), plunged, plunging.
to cast or thrust forcibly or suddenly into something, as a liquid, a penetrable substance, a place, etc.; immerse; submerge: to plunge a dagger into one's heart.
to bring suddenly or forcibly into some condition, situation, etc.: to plunge a country into war; to pull a switch and plunge a house into darkness.
Horticulture. to place (a potted plant) up to its rim in soil or in certain other materials, as sand or moss.
Surveying. to transit (the telescope of a transit or theodolite).
verb (used without object), plunged, plunging.
to cast oneself, or fall as if cast, into water, a hole, etc.
to rush or dash with headlong haste: to plunge through a crowd.
to bet or speculate recklessly: to plunge on the stock market.
to throw oneself impetuously or abruptly into some condition, situation, matter, etc.: to plunge into debt.
to descend abruptly or precipitously, as a cliff, road, etc.
to pitch violently forward, as a horse, ship, etc.
act of plunging.
a leap or dive, as into water.
a headlong or impetuous rush or dash: a plunge into danger.
a sudden, violent pitching movement.
a place for plunging or diving, as a swimming pool.
Geology, pitch ( def 48 ).
take the plunge, to enter with sudden decision upon an unfamiliar course of action, as after hesitation or deliberation: She took the plunge and invested her entire savings in the plan.

1325–75; Middle English < Middle French plung(i)erVulgar Latin *plumbicāre to heave the lead. See plumb

replunge, verb, replunged, replunging; noun
unplunged, adjective

1. See dip1. 5. dive. 6. hasten. 9. drop.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
plunge (plʌndʒ)
1.  (usually foll by into) to thrust or throw (something, oneself, etc): they plunged into the sea
2.  to throw or be thrown into a certain state or condition: the room was plunged into darkness
3.  (usually foll by into) to involve or become involved deeply (in): he plunged himself into a course of Sanskrit
4.  (intr) to move or dash violently or with great speed or impetuosity
5.  (intr) to descend very suddenly or steeply: the ship plunged in heavy seas; a plunging neckline
6.  informal (intr) to speculate or gamble recklessly, for high stakes, etc
7.  a leap or dive as into water
8.  informal a swim; dip
9.  chiefly (US) a place where one can swim or dive, such as a swimming pool
10.  a headlong rush: a plunge for the exit
11.  a pitching or tossing motion
12.  informal take the plunge
 a.  to resolve to do something dangerous or irrevocable
 b.  to get married
[C14: from Old French plongier, from Vulgar Latin plumbicāre (unattested) to sound with a plummet, from Latin plumbum lead]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1380, from O.Fr. plungier (c.1140), from V.L. *plumbicare "to heave the lead," from L. plumbum "lead" (see plumb). Original notion perhaps is of a sounding lead or a fishing net weighted with lead. Fig. use in take the plunge "commit oneself" is from 1845. Plunger as a mechanism
is from 1777. Plunging neckline attested from 1949.
Online Etymology Dictionary, © 2010 Douglas Harper
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