touch off

touch off idiom
  1. Cause to explode or fire; also, initiate, trigger. For example, The boys touched off a whole line of firecrackers, or These disclosures will touch off a public uproar. This idiom comes from early firearms, which were set off by putting a light to the touch-hole. Its figurative use dates from the late 1800s.
  2. Depict very precisely, as in He touched off Teddy Roosevelt as well as it's ever been done. [Mid-1700s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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