1. [n]  a steep nose-down descent by an aircraft
2. [n]  a headlong plunge into water
3. [n]  a cheap disreputable nightclub or dance hall
4. [v]  swim under water; "the children enjoyed diving and looking for shells"
5. [v]  plunge into water; "I was afraid to dive from the board into the pool"
6. [v]  drop steeply; "the stock market plunged"

Dive
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1. \Dive\, v. i. [imp. & p. p. {Dived}, colloq. {Dove}, a
   relic of the AS. strong forms de['a]f, dofen; p. pr. & vb. n.
   {Diving}.] [OE. diven, duven, AS. d?fan to sink, v. t., fr.
   d?fan, v. i.; akin to Icel. d?fa, G. taufen, E. dip, deep,
   and perh. to dove, n. Cf. {Dip}.]
   1. To plunge into water head foremost; to thrust the body
      under, or deeply into, water or other fluid.
            It is not that pearls fetch a high price because men
            have dived for them.                  --Whately.
   Note: The colloquial form dove is common in the United States
         as an imperfect tense form.
               All [the walruses] dove down with a tremendous
               splash.                            --Dr. Hayes.
               When closely pressed it [the loon] dove . . . and
               left the young bird sitting in the water. --J.
                                                  Burroughs.
   2. Fig.: To plunge or to go deeply into any subject,
      question, business, etc.; to penetrate; to explore.
      --South.
   

2. \Dive\, v. t.
   1. To plunge (a person or thing) into water; to dip; to duck.
      [Obs.] --Hooker.
   2. To explore by diving; to plunge into. [R.]
            The Curtii bravely dived the gulf of fame. --Denham.
            He dives the hollow, climbs the steeps. --Emerson.
   

3. \Dive\, n.
   1. A plunge headforemost into water, the act of one who
      dives, literally or figuratively.
   2. A place of low resort. [Slang]
            The music halls and dives in the lower part of the
            city.                                 --J.
                                                  Hawthorne.