Definition of "Plunge" :

noun: a brief swim in water

noun: a steep and rapid fall

verb: begin with vigor

"She plunged into a dangerous adventure."

verb: devote (oneself) fully to

verb: cause to be immersed

"The professor plunged his students into the study of the Italian text."

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

verb: thrust or throw into

verb: dash violently or with great speed or impetuosity

"She plunged at it eagerly."

verb: drop steeply

"The stock market plunged."

verb: fall abruptly

"It plunged to the bottom of the well."