plunge - noun

a brief swim in water

a steep and rapid fall

plunge - verb

• thrust or throw into
• drop steeply
• dash violently or with great speed or impetuosity
• begin with vigor
• cause to be immersed
• fall abruptly
• immerse briefly into a liquid so as to wet, coat, or saturate
• devote (oneself) fully to

plunge - thesaurus

absorb   dip   dive   douse   dump   dunk   engross   engulf   immerse   launch   plunk   souse   steep