plunge

to plunge the body into water

Jon isn’t lying when he tells her she will always be his queen, right before plunging a knife into her. He genuinely swore obedience, and sees himself as a traitor when he commits the deeds.

he plunged into the river

to plunge into debt; to plunge into controversy

[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: […]

Plunged and gravelled with three lines of Seneca.