plunge

cause to be immersed

“The professor plunged his students into the study of the Italian text”

dash violently or with great speed or impetuosity

“She plunged at it eagerly”

begin with vigor

“She plunged into a dangerous adventure”

immerse briefly into a liquid so as to wet, coat, or saturate

drop steeply

“the stock market plunged”

thrust or throw into

fall abruptly

“It plunged to the bottom of the well”

devote (oneself) fully to

a brief swim in water

a steep and rapid fall