fire something off
phrasal verb with fire verb uk/faɪər/ us/faɪr/
(SHOT)
开枪射击
to fire a shot from a gun
They fired off several shots to frighten us. 他们开了几枪，想要吓唬我们。
(LETTER)
寄发（言辞激愤的信件）
to write and send an angry letter to someone
He fired off an angry letter to the editor. 他给主编写了一封言辞激愤的信。