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Related to let fly: be damned, get to the bottom of, no less, pay a visit
let fly (with) somethingalso let something fly
1. to throw something or shoot something from a weapon Police officers let fly canisters of tear gas. The guy in the leather jacket was leaping over the counter when I let fly with a soda bottle.
2. to express yourself in a way that will excite or anger others If you disagree with the officials, it's bad form to let fly with four-letter words. When she got together with her friends, they would let fly all their innermost secrets.
let fly (something)
to start shouting angrily (sometimes + at ) I was so angry I let fly at them as soon as they came in. Gripping the arms of his chair, he let fly a barrage of offensive comments.
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.
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.