[roost] n [ME, fr. OE hrost; akin to OS hrost attic] (bef. 12c) 1 a: a support on which birds rest b: a place where winged animals and esp. birds customarily roost
2: a group of birds (as fowl) roosting together
[2]roost vi (1530) 1: to settle down for rest or sleep: perch
2: to settle oneself as if on a roost ~ vt: to supply a roost for or put to roost