Focus on the pronunciation of fire sth off
English definition of “fire sth off”
fire sth off — Phrasal Verb with fire
/faɪər/ verb [T] (UK also sack)
› COMMUNICATIONS to quickly write and send a message, letter, etc.: He can fire off an email with a question and usually get an answer within a few hours. She fired off an angry letter to staff warning them not to "bad-mouth" colleagues.