Dictionary.net

engross (oneself) fully; "He immersed himself into his studies"

begin with vigor; "He launched into a long diatribe"; "She plunged into a dangerous adventure"

a steep and rapid fall

dash violently or with great speed or impetuosity; "She plunged at it eagerly"

engross (oneself) fully; "He immersed himself into his studies"

Thrust or throw into; "Immerse yourself in the hot water"

begin with vigor; "He launched into a long diatribe"; "She plunged into a dangerous adventure"

a steep and rapid fall

dash violently or with great speed or impetuosity; "She plunged at it eagerly"

To baptize by immersion.

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.

To entangle; to embarrass; to overcome.

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.

To pitch or throw one's self headlong or violently forward, as a horse does.

To bet heavily and with seeming recklessness on a race, or other contest; in an extended sense, to risk large sums in hazardous speculations.

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.

Hence, a desperate hazard or act; a state of being submerged or overwhelmed with difficulties.

The act of pitching or throwing one's self headlong or violently forward, like an unruly horse.

Heavy and reckless betting in horse racing; hazardous speculation.

To baptize by immersion.

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.

To entangle; to embarrass; to overcome.

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.

To pitch or throw one's self headlong or violently forward, as a horse does.

To bet heavily and with seeming recklessness on a race, or other contest; in an extended sense, to risk large sums in hazardous speculations.

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.

Hence, a desperate hazard or act; a state of being submerged or overwhelmed with difficulties.

The act of pitching or throwing one's self headlong or violently forward, like an unruly horse.

Heavy and reckless betting in horse racing; hazardous speculation.

To put suddenly into water or any other liquid.

To sink, fall, or rush, as into water; dive; throw the body forward; enter suddenly and quickly; as, to plunge into the woods.

The act of suddenly and quickly jumping, falling, entering, etc.; a sudden fall.

To cast suddenly into water or other fluid: to force suddenly (into): to baptize by immersion.

To sink suddenly into any fluid: to dive: to rush headlong, as a horse: to rush into any danger.

Act of plunging: act of rushing headlong, as a horse.

Act of plunging.

To cast suddenly into any fluid; immerse; thrust.

To thrust or throw suddenly into water or the like.

To jump, dive, or rush, as into water; descend abruptly; leap; fall.

The act of plunging; any sudden and violent motion.

Plunger.

n. Act of thrusting into water or any penetrable substance;—hence, act of sinking in or being overwhelmed by difficulties;—act of throwing down the head and raising the hind quarters, as a horse trying to throw its rider.