To let fly

To throw or drive with violence; to discharge.
(Naut.) To let go suddenly and entirely; as, to let fly the sheets.
- Addison.
to discharge with violence, as a blow, an arrow, or stone. See under Drive, and Fly.

See also: Fly, Fly, Let

References in classic literature ?
On the cupola that surmounted the edifice was the gilded figure of an Indian chief, ready to let fly an arrow from his bow.
And of course they must see her light, and if they guess we are near it they are sure to let fly.
Our two men, as they confessed to me, were grieved to be obliged to kill so many poor creatures, who had no notion of their danger; yet, having them all thus in their power, and the first having loaded his piece again, resolved to let fly both together among them; and singling out, by agreement, which to aim at, they shot together, and killed, or very much wounded, four of them; the fifth, frightened even to death, though not hurt, fell with the rest; so that our men, seeing them all fall together, thought they had killed them all.
said Henrietta, seeing the king's eyes constantly turned towards the door, and wishing to let fly a little poisoned arrow at his heart, supposing he was so anxiously expecting either La Valliere or a letter from her.
The place turned out to be in the wrong part of Shropshire, damn it, and though he never damned his own property aloud, he was only waiting to get it off his hands, and then to let fly.
Bayern should have extended their lead moments later, but Lloris pulled off a fantastic stop to deny Robben before Jean Makoun's challenge stole the ball off Olic as he was about to let fly with his hat-trick in his sights.
1 : to let fly or cause to be driven forward with force <He shot an arrow into the air.
Dickson Etuhu's drive rebounded off Shaun Goater and Michael Hughes raced upfield unchecked to let fly from 25 yards.
Stallard then picked out Hughes as he raced into the box to let fly from 15 yards out, before making it 4-1 himself when he lobbed keeper Ian Gray.
Also, 'tisn't cricket for a British Spitfire to let fly at an American B-25.