The Collaborative International Dictionary of English v.0.48:

Dive \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.
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            It is not that pearls fetch a high price because men
            have dived for them.                  --Whately.
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   Note: The colloquial form dove is common in the United States
         as an imperfect tense form.
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               All [the walruses] dove down with a tremendous
               splash.                            --Dr. Hayes.
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               When closely pressed it [the loon] dove . . . and
               left the young bird sitting in the water. --J.
                                                  Burroughs.
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   2. Fig.: To plunge or to go deeply into any subject,
      question, business, etc.; to penetrate; to explore.
      --South.
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The Collaborative International Dictionary of English v.0.48:

Diva \Di"va\ (d[=e]"v[.a]), n.; It. pl. Dive (d[=e]"v[=a]).
   [It., prop. fem. of divo divine, L. divus.]
   A prima donna.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Dive \Dive\, v. t.
   1. To plunge (a person or thing) into water; to dip; to duck.
      [Obs.] --Hooker.
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   2. To explore by diving; to plunge into. [R.]
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            The Curtii bravely dived the gulf of fame. --Denham.
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            He dives the hollow, climbs the steeps. --Emerson.
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The Collaborative International Dictionary of English v.0.48:

Dive \Dive\, n.
   1. A plunge headforemost into water, the act of one who
      dives, literally or figuratively.
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   2. A place of low resort. [Slang]
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            The music halls and dives in the lower part of the
            city.                                 --J.
                                                  Hawthorne.
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WordNet (r) 3.0 (2006):

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