plunge

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).

to cast oneself, or fall as if cast, into water, a hole, etc.

Synonyms:

dive

to rush or dash with headlong haste.

to plunge through a crowd.

Synonyms:

hasten

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.

Synonyms:

drop

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.

(usually foll by into) to thrust or throw (something, oneself, etc)

they plunged into the sea

to throw or be thrown into a certain state or condition

the room was plunged into darkness

(usually foll by into) to involve or become involved deeply (in)

he plunged himself into a course of Sanskrit

(intr) to move or dash violently or with great speed or impetuosity

(intr) to descend very suddenly or steeply

the ship plunged in heavy seas

a plunging neckline

informal (intr) to speculate or gamble recklessly, for high stakes, etc