Synonyms for Touch off:

n.

inflict, bring on, invite, give rise to something, unloose, precipitate, loose. light. cause, initiate, begin, release. touch off (noun)
actuate, activate, spark, trip, trigger off, trigger, spark off.

v.

excite (verb)
precipitate.
fire (verb)
light, loose.
motivate (verb)
cause, spark, actuate, trigger.

Other synonyms:

inflict, bring on, unloose. invite, precipitate. cause. loose. Other relevant words:
cause, begin, initiate, light, precipitate, bring on.