Source : Webster's Revised Unabridged Dictionary (1913)

Bet \Bet\, n. [Prob. from OE. abet abetting, OF. abet, fr.
   abeter to excite, incite. See {Abet}.]
   That which is laid, staked, or pledged, as between two
   parties, upon the event of a contest or any contingent issue;
   the act of giving such a pledge; a wager. ``Having made his
   bets.'' --Goldsmith.

Bet \Bet\, v. t. [imp. & p. p. {Bet}, {Betted}; p. pr. & vb. n.
   {Betting}.]
   To stake or pledge upon the event of a contingent issue; to
   wager.

         John a Gaunt loved him well, and betted much money on
         his head.                                --Shak.

         I'll bet you two to one I'll make him do it. --O. W.
                                                  Holmes.

Bet \Bet\, v. t. [imp. & p. p. {Bet}, {Betted}; p. pr. & vb. n.
   {Betting}.]
   To stake or pledge upon the event of a contingent issue; to
   wager.

         John a Gaunt loved him well, and betted much money on
         his head.                                --Shak.

         I'll bet you two to one I'll make him do it. --O. W.
                                                  Holmes.

Bet \Bet\,
   imp. & p. p. of {Beat}. [Obs.]

Bet \Bet\, a. & adv.
   An early form of {Better}. [Obs.]

   {To go bet}, to go fast; to hurry. [Obs.] --Chaucer.

Source : WordNet®

bet
     n 1: the money risked on a gamble [syn: {stake}, {stakes}, {wager}]
     2: the act of gambling; "he did it on a bet" [syn: {wager}]
     [also: {betting}, {betted}]

bet
     v 1: maintain with or as if with a bet; "I bet she will be
          there!" [syn: {wager}]
     2: stake on the outcome of an issue; "I bet $100 on that new
        horse"; "She played all her money on the dark horse" [syn:
         {wager}, {play}]
     3: have faith or confidence in; "you can count on me to help
        you any time"; "Look to your friends for support"; "You
        can bet on that!"; "Depend on your family in times of
        crisis" [syn: {count}, {depend}, {look}, {calculate}, {reckon}]
     [also: {betting}, {betted}]