trigger off vs touch off

trigger off and touch off both are verbs.

Word	Noun	Adjective	Verb	Adverb
trigger off	No	No	Yes	No
touch off	No	No	Yes	No

As verbs, trigger off and touch off are synonyms defined as:

Other synonyms of trigger off include activate, actuate, set off, spark, spark off, trigger, trip.

trigger off (verb)	touch off (verb)
put in motion or move to act	put in motion or move to act