Source : Webster's Revised Unabridged Dictionary (1913)

Trip \Trip\, n. i. [imp. & p. p. {Tripped}; p. pr. & vb. n.
   {Tripping}.] [OE. trippen; akin to D. trippen, Dan. trippe,
   and E. tramp. See {Tramp}.]
   1. To move with light, quick steps; to walk or move lightly;
      to skip; to move the feet nimbly; -- sometimes followed by
      it. See {It}, 5.

            This horse anon began to trip and dance. --Chaucer.

            Come, and trip it, as you go, On the light fantastic
            toe.                                  --Milton.

            She bounded by, and tripped so light They had not
            time to take a steady sight.          --Dryden.

   2. To make a brief journey or pleasure excursion; as, to trip
      to Europe.

   3. To take a quick step, as when in danger of losing one's
      balance; hence, to make a false; to catch the foot; to
      lose footing; to stumble.

   4. Fig.: To be guilty of a misstep; to commit an offense
      against morality, propriety, or rule; to err; to mistake;
      to fail. ``Till his tongue trip.'' --Locke.

            A blind will thereupon comes to be led by a blind
            understanding; there is no remedy, but it must trip
            and stumble.                          --South.

            Virgil is so exact in every word that none can be
            changed but for a worse; he pretends sometimes to
            trip, but it is to make you think him in danger when
            most secure.                          --Dryden.

            What? dost thou verily trip upon a word? --R.
                                                  Browning.

Source : WordNet®

trip
     n 1: a journey for some purpose (usually including the return);
          "he took a trip to the shopping center"
     2: a hallucinatory experience induced by drugs; "an acid trip"
     3: an accidental misstep threatening (or causing) a fall; "he
        blamed his slip on the ice"; "the jolt caused many slips
        and a few spills" [syn: {slip}]
     4: an exciting or stimulting experience [syn: {head trip}]
     5: a catch mechanism that acts as a switch; "the pressure
        activates the tripper and releases the water" [syn: {tripper}]
     6: a light or nimble tread; "he heard the trip of women's feet
        overhead"
     7: an unintentional but embarrassing blunder; "he recited the
        whole poem without a single trip"; "he arranged his robes
        to avoid a trip-up later"; "confusion caused his
        unfortunate misstep" [syn: {trip-up}, {stumble}, {misstep}]
     [also: {tripping}, {tripped}]

trip
     v 1: miss a step and fall or nearly fall; "She stumbled over the
          tree root" [syn: {stumble}]
     2: cause to stumble; "The questions on the test tripped him up"
        [syn: {trip up}]
     3: make a trip for pleasure [syn: {travel}, {jaunt}]
     4: put in motion or move to act; "trigger a reaction"; "actuate
        the circuits" [syn: {actuate}, {trigger}, {activate}, {set
        off}, {spark off}, {spark}, {trigger off}, {touch off}]
     5: get high, stoned, or drugged; "He trips every weekend" [syn:
         {trip out}, {turn on}, {get off}]
     [also: {tripping}, {tripped}]

tripped
     See {trip}