II. WORDS RELATING TO SPACE

IV. MOTION

4. Motion with reference to direction

Plunge.

[Antonyms: leap.]

[Nouns] plunge, dip, dive, header; ducking; diver.

[Verbs] plunge, dip, souse, duck; dive, plump; take a plunge, take a header; make a plunge; bathe (water) [more].

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.