Definition of fire off phrasal verb from the Oxford Advanced Learner's Dictionary

 

fire off

 phrasal verb
phrasal verb Anger
 
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Phrasal Verbs
  1. 1to shoot a bullet from a gun They fired off a volley of shots.
  2. 2to write or say something to somebody very quickly, often when you are angry He fired off a letter of complaint. She spent an hour firing off emails to all concerned. See related entries: Anger
See the Oxford Advanced American Dictionary entry: fire off