WordNet sense 1 (be contingent on):

ride, depend on, depend upon, devolve on, hinge on, hinge upon

WordNet sense 2 (cause to be agitated, excited, or roused):

agitate, charge, excite, rouse, commove, charge up

WordNet sense 3 (stimulate sexually):

arouse, wind up

WordNet sense 4 (cause to operate by flipping a switch):

switch on

WordNet sense 5 (get high, stoned, or drugged):

trip, get off, trip out