Source : Webster's Revised Unabridged Dictionary (1913)

Plunge \Plunge\, v. t. [imp. & p. p. {Plunged}; p. pr. & vb. n.
   {Plunging}.] [OE. ploungen, OF. plongier, F. plonger, fr.
   (assumed) LL. plumbicare, fr. L. plumbum lead. See {Plumb}.]
   1. To thrust into water, or into any substance that is
      penetrable; to immerse; to cause to penetrate or enter
      quickly and forcibly; to thrust; as, to plunge the body
      into water; to plunge a dagger into the breast. Also used
      figuratively; as, to plunge a nation into war. ``To plunge
      the boy in pleasing sleep.'' --Dryden.

            Bound and plunged him into a cell.    --Tennyson.

            We shall be plunged into perpetual errors. --I.
                                                  Watts.

   2. To baptize by immersion.

   3. To entangle; to embarrass; to overcome. [Obs.]

            Plunged and graveled with three lines of Seneca.
                                                  --Sir T.
                                                  Browne.