'At roost' definitions:
Definition of 'At roost'
From: GCIDE
- Roost \Roost\, n. [AS. hr[=o]st; akin to OD. roest roost, roesten to roost, and probably to E. roof. Cf. Roof.]
- 1. The pole or other support on which fowls rest at night; a perch. [1913 Webster]
- He clapped his wings upon his roost. --Dryden. [1913 Webster]
- 2. A collection of fowls roosting together. [1913 Webster]
- At roost, on a perch or roost; hence, retired to rest. [1913 Webster]