WordNet sense 1 (an accidental misstep threatening (or causing) a fall):

slip

WordNet sense 2 (an exciting or stimulating experience):

head trip

WordNet sense 3 (a catch mechanism that acts as a switch):

tripper

WordNet sense 4 (make a trip for pleasure):

jaunt, travel

WordNet sense 5 (cause to stumble):

trip up

WordNet sense 6 (miss a step and fall or nearly fall):

stumble

WordNet sense 7 (put in motion or move to act):

activate, actuate, spark, trigger, set off, spark off, touch off, trigger off

WordNet sense 8 (get high, stoned, or drugged):

get off, turn on, trip out

WordNet sense 9 (an unintentional but embarrassing blunder):

misstep, trip-up