1. Send, dispatch, say or ask quickly
   "He fired off an angry email to customer service"; "The reporter fired off a series of questions to the politician"
    
2. To shoot or launch a projectile or weapon
   "The soldiers fired off a volley of bullets"
    
3. To start or initiate suddenly
   "The band fired off their set with their most popular song"

Derived forms: firing off, fires off, fired off