What does "roost" mean?

See roost in WNW Idioms

come home to roost

to have repercussions, esp. disagreeable ones; boomerang

rule the roost

to be master

See roost in American Heritage Dictionary 4 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.

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