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Verb: touch off  tú-chóf
  1. Put in motion, initiate (a device, reaction, circuit, etc)
    "touch off the circuits";
    - actuate, trigger, activate, set off, spark off, spark, trigger off
     
  2. Cause to start, provoke or initiate (usually something negative or violent)
    "touched off riots"; "touch off a huge argument";
    - spark off, spark, set off, trigger

Derived forms: touches off, touched off, touching off

Type of: initiate, pioneer