Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class II. Words Relating to Space
Section IV. Motion
4. Motion with Reference to Direction

310. Plunge.

   NOUN:PLUNGE, dip, dive, nose dive [aviation], header [colloq.]; ducking &c. v.
  SUBMERGENCE, submersion, immersion, engulfment [rare].
  DIVER; diving bird, loon, auk, penguin, grebe, sea duck &c.
   VERB:PLUNGE, dip, souse, duck; dive, plump; take a -plunge, – header [colloq.]; make a plunge; bathe (water) [See Water]; pitch.
  SUBMERGE, submerse; immerse; douse or dowse, sink, engulf, send to the bottom; send to -Davy Jones’s locker, – feed the fishes.
  FOUNDER, welter, wallow; get out of one’s depth; go to the bottom, go down like a stone.
   ADJECTIVE:PLUNGING &c. v.; submergible, submersible; soundable.