(idiom) Literally meaning "the entire nest came out"; used to describe mobilizing every available person or all of one's strength, often used with a negative connotation.

to pour out of a nest like bees or ants; used to describe a group (often an enemy or gang) using all of its available strength or manpower for an operation

(idiom) to turn out in full force to launch an attack; to empty the nest to invade