[1] : The Collaborative International Dictionary of English v.0.48

trip \trip\, v. t.
   1. to cause to stumble, or take a false step; to cause to
      lose the footing, by striking the feet from under; to
      cause to fall; to throw off the balance; to supplant; --
      often followed by up; as, to trip up a man in wrestling.
      1913 webster

            the words of hobbes's defense trip up the heels of
            his cause.                            --abp.
                                                  bramhall.
      1913 webster

   2. fig.: to overthrow by depriving of support; to put an
      obstacle in the way of; to obstruct; to cause to fail.
      1913 webster

            to trip the course of law, and blunt the sword.
                                                  --shak.
      1913 webster

   3. to detect in a misstep; to catch; to convict; also called
      trip up. r.
      1913 webster

            these her women can trip me if i err. --shak.
      1913 webster

   4. naut.
      a to raise an anchor from the bottom, by its cable or
          buoy rope, so that it hangs free.
      b to pull a yard into a perpendicular position for
          lowering it.
          1913 webster

   5. mach. to release, let fall, or set free, as a weight or
      compressed spring, as by removing a latch or detent; to
      activate by moving a release mechanism, often
      unintentionally; as, to trip an alarm.
      1913 webster +pjc
see also:
trip up 

[2] : WordNet (r) 2.0

trip up
     v 1: detect a blunder or misstep; "the reporter tripped up the
          senator" syn: catch
     2: cause to stumble; "the questions on the test tripped him up"
        syn: trip
     3: make an error; "she slipped up and revealed the name" syn:
        stumble, slip up
see also:
catch trip stumble slip up 

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