Roget's Thesaurus: Entry 310 (Plunge -- N)

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#310. Plunge -- N. plunge, dip, dive, header; ducking &c. v.; diver.

V. plunge, dip, souse, duck; dive, plump; take a plunge, take a header; make a plunge; bathe &c.(water) 337.

submerge, submerse; immerse; douse, sink, engulf, send to the bottom.

get out of one's depth; go to the bottom, go down like a stone, drop like a lead balloon; founder, welter, wallow.