Definitions from Wiktionary (touch off)

▸ verb:  (transitive, idiomatic) To start (something); to set off traps; especially used for unstable situations that may magnify if disturbed.
▸ verb:  (transitive, idiomatic) To cause a fire to start.
▸ verb:  (machining) To establish a reference coordinate or datum, by moving the tool head to just touch the workpiece or machine bed.



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