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The Collaborative International Dictionary
To rule the roast

Roast \Roast\, n. That which is roasted; a piece of meat which has been roasted, or is suitable for being roasted.

A fat swan loved he best of any roost [roast].
--Chaucer.

To rule the roast, to be at the head of affairs. ``The new-made duke that rules the roast.''
--Shak.