fire off
phrasal verbfire something  off 
- to shoot a bullet from a gun开枪;射击 - They fired off a volley of shots.他们举枪齐射。 
 
- They fired off a volley of shots.
- to write or say something to somebody very quickly, often when you are angry(常指愤怒地)连珠炮似的说,奋笔疾书 - He fired off a letter of complaint.他奋笔写了一封投诉信。 
- She spent an hour firing off emails to all concerned.她花了一个小时气冲冲地向有关各方发电邮。 
 
- He fired off a letter of complaint.