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1. To launch something, often as a weapon. At the sound of the whistle, the kids let fly water balloons.
2. To launch into a verbal attack. I don't know what made him so angry, but he suddenly let fly with a string of expletives.
Discharge a missile or fire a weapon; also, attack verbally. For example, He let fly a rotten egg at the speaker, or They let fly some insults laced with four-letter words. The first usage dates from about a.d. 1000, the second from the late 1500s.
let ˈfly (at somebody/something) (with something)(informal)
1 throw, shoot, etc. something with great force: He aimed his gun and let fly.
2 attack somebody/something: When I told him that I couldn’t find the letter, he let fly at me. ♢ She let fly at her neighbour with a stream of insults.
1. To shoot, hurl, or release: The troops let fly a volley of gunfire.
2. To lash out; assault: The mayor let fly with an angry attack on her critics.