plunge

1. (transitive) To thrust into liquid, or into any penetrable substance; to immerse.Examples: "to plunge the body into water"; ""Most of them don't wash. Those who do usually plunge their head into some brook or rill, if there happens to be one about.""transitive

2. (figuratively, transitive) To cast, stab or throw deep and fast into some thing, state, condition or action.Examples: "to plunge a dagger into the breast"; "to plunge a nation into war"; "the city was plunged into darkness"figurativelytransitive

3. (transitive, obsolete) To baptize by immersion.obsoletetransitive

4. (intransitive) To dive, leap or rush (into water or some liquid); to submerge oneself.Examples: "he plunged into the river"intransitive

5. (figuratively, intransitive) To fall or rush headlong into some thing, action, state or condition.Examples: "to plunge into debt"; "to plunge into controversy"; "profits plunge 90%"figurativelyintransitive

6. (intransitive) To pitch or throw oneself headlong or violently forward, as a horse does.Examples: "[N]ature affects a looſe kinde of liberty, vvhich it cannot indure to have reſtrained: neither fares it othervviſe vvith it, then vvith ſome vvilde colt; which at the firſt taking up, flings and plunges, and vvill ſtand on no ground; but after it hath been ſomvvhile diſciplin'd at the Poſt, is grovvn tractable, and quietly ſubmits either to the ſaddle, or the collar: […]"intransitive