/roohst/ , n.
1. a perch upon which birds or fowls rest at night.
2. a large cage, house, or place for fowls or birds to roost in.
3. a place for sitting, resting, or lodging.
4. rule the roost , to be in charge or control; dominate: It was only too apparent that his grandfather ruled the roost.
v.i.
5. to sit or rest on a roost, perch, etc.
6. to settle or stay, esp. for the night.
7. come home to roost , (of an action) to revert or react unfavorably to the doer; boomerang: an evil deed that came home to roost and ruined his life.
[ bef. 1100; ME roost (n.), OE hrost; c. MD roest ]