1. phrasal verb
If you fire off a shot, you send a bullet or other missile from a gun.
[V P n] ⇒ A gunman fired off a volley of shots into the air.
[V P n (not pron)] ⇒ Cecil now began to panic and fired off two distress rockets.
[V n P] ⇒ ...an illustration of a guy firing a huge cannon off into the distance.
2. phrasal verb → fire If you fire off a letter, question, or remark, you send or say it very quickly, often as part of a series.
[V P n] ⇒ He immediately fired off an angry letter to his ministry colleagues.
[V P n (not pron)] ⇒ Ordinary officers fired off a string of angry demands to the government, to improve
their pay, status, and conditions.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers