Noun:
1: trip a journey for some purpose (usually including the return); "he took a trip to the shopping center"
2: trip a hallucinatory experience induced by drugs; "an acid trip"
3: slip, trip an accidental misstep threatening (or causing) a fall; "he blamed his slip on the ice"; "the jolt caused many slips and a few spills"
4: trip, head trip an exciting or stimulating experience
5: trip, tripper a catch mechanism that acts as a switch; "the pressure activates the tripper and releases the water"
6: trip a light or nimble tread; "he heard the trip of women's feet overhead"
7: trip, stumble, misstep, trip-up 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"
Verb:
1: stumble, trip miss a step and fall or nearly fall; "She stumbled over the tree root"
2: trip up, trip cause to stumble; "The questions on the test tripped him up"
3: jaunt, trip, travel make a trip for pleasure
4: touch off, trigger, trip, activate, spark off, trigger off, actuate, set off, spark put in motion or move to act; "trigger a reaction"; "actuate the circuits"
5: trip out, turn on, trip, get off get high, stoned, or drugged; "He trips every weekend"