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roost / roōst/ • n. a place where birds regularly settle or congregate to rest at night, or where bats congregate to rest in the day.• v. [intr.] (of a bird or bat) settle or congregate for rest or sleep: migrating martins and swallows were settling to roost.PHRASES: come home to roost (of a scheme, etc.) recoil unfavorably upon the originator: ensuring that the liability does not come home to roost.rule the roost see rule.

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