Rule the roost

Pro Tip 1/3

Used when someone has the final decision-making power, often in a family or small group.

At family reunions, my grandmother always rules the roost.

Pro Tip 2/3

Mostly used in casual conversation, not in formal or business environments.

During the team outing, it seemed like the interns ruled the roost.

Pro Tip 3/3

Often carries a humorous or light-hearted tone, especially when power is unexpected.

Despite the new manager, it’s the office cat that really rules the roost.