okay beats me...
1. A perch on which domestic fowl or other birds rest or sleep.
2. A place with perches for fowl or other birds.
3. A place for temporary rest or sleep.
intr.v. roost·ed, roost·ing, roosts
To rest or sleep on or as if on a perch or roost.
Idioms:
come home to roost
To have repercussions or aftereffects, especially unfavorable ones: The consequences of your mistake will eventually come home to roost.
rule the roost Informal
To be in charge; dominate: In this house my parents rule the roost.