To cause to explode
detonate, light the fuse, light, set off; see explode 1.
To cause to start
start, initiate, release; see begin 1, cause 2.
"touch-off." YourDictionary, n.d. Web. 26 May 2018. <http://thesaurus.yourdictionary.com/touch-off>.
touch-off. (n.d.). Retrieved May 26th, 2018, from http://thesaurus.yourdictionary.com/touch-off