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Definition of plunge : 1. Heavy and reckless betting in horse racing; hazardous speculation.
2. Hence, a desperate hazard or act; a state of being submerged or overwhelmed with difficulties.
3. The act of pitching or throwing one's self headlong or violently forward, like an unruly horse.
4. The act of thrusting into or submerging; a dive, leap, rush, or pitch into, or as into, water; as, to take the water with a plunge.
5. To baptize by immersion.
6. To bet heavily and with seeming recklessness on a race, or other contest; in an extended sense, to risk large sums in hazardous speculations.
7. To entangle; to embarrass; to overcome.
8. To pitch or throw one's self headlong or violently forward, as a horse does.
9. To thrust into water, or into any substance that is penetrable; to immerse; to cause to penetrate or enter quickly and forcibly; to thrust; as, to plunge the body into water; to plunge a dagger into the breast. Also used figuratively; as, to plunge a nation into war.
10. To thrust or cast one's self into water or other fluid; to submerge one's self; to dive, or to rush in; as, he plunged into the river. Also used figuratively; as, to plunge into debt.

Synonyms:

infuse, plank, set up, draw, plunk, leap, found, imbibe, establish, magnetic dip, dowse, underprice, cutpurse, drive, clunk, suck, skid, pick, knock down, drench, inclination, plop, move, ingest, steep, swallow, put in, hit it up, stab, bury, pluck, sop up, spill, flump, swallow up, plump down, take over, go down, thrust, put out, wade in, dim, take up, floor, plump, pickpocket, clop, enter, coldcock, rise, take in, launch, suck up, nose-dive, engage, duck, dump, clump, soak, plonk, occupy, ram, sop, ditch, dig, plunk down, souse, angle of dip, forge, soak up, increase, assimilate, deck, immerge, eat up, engross, free fall, absorb, lunge, stick, set in motion, inebriate, magnetic inclination

descent, comedown, slope, grade

dunk, submerge, bathe, engulf, flood, douse, wallow, drown, sink, immerse, inundate, dip

settle, slide, come down, descend, lower, decline, plummet, fall down, drop, slump, fall, topple, tumble, slip

depress, deepen, shorten

jog, gallop, scurry, scoot, scamper, canter, race, bound, hurry, lope, tear, rush, run, dart, trot, scramble, sprint, dash

pitch, dive, swoop

Usage examples:

• We do not learn if on that occasion the scruples of the King were discussed or not; but as his questions to the judges already betrayed his inclination to such a course, so now he actually resolved to plunge into the contradiction which he had wished to avoid, and accept the Petition while at the same time, in accordance with the sentence of the Judges, he would reserve for himself the future exercise of the right therein denied. - "A History of England Principally in the Seventeenth Century, Volume I (of 6)", Leopold von Ranke.
• Suddenly the two ships took their final plunge. - "The Boy Allies at Jutland", Robert L. Drake.
• The cry seemed to be answered by a shout; and a second time, after a wild plunge, the horse fell, now throwing Shamus off with a force that left him stunned. - "Stories by English Authors: Ireland", Various.