I. ˈrüst noun
Etymology: Middle English, from Old English hrōst; akin to Old Saxon hrōst attic
Date: before 12th century
1.
a. : a support on which birds rest
b. : a place where winged animals and especially birds customarily roost
2. : a group of birds roosting together
II. verb
Date: 1530
intransitive verb
1. : to settle down for rest or sleep : perch
2. : to settle oneself as if on a roost
transitive verb
: to supply a roost for or put to roost