Webster's English Dictionary

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roost

1. roost \'ru:st\ n [ME, fr. OE hro-st; akin to MD roest roost, OSlav krada 
   pi]le of wood 1a: a support on which birds rest  1b: a place where birds 
   customarily roost  2: a group of birds (as fowl) roosting together 
2. roost vi 1: to settle down for rest or sleep : PERCH  2: to settle 
   oneself as if on a roost  : to supply a roost for or put to roost