fire off

phrasal verb
1
to shoot a bullet from a gun
شلیک کردن, تیراندازی کردن, گلوله شلیک کردن
2
to write or say something to somebody very quickly, often when you are angry
به سرعت گفتن, با عجله نوشتن, با عصبانیت پاسخ دادن, سریع نوشتن یا گفتن
He fired off a letter of complaint.
She spent an hour firing off emails to all concerned.