Idiom of the day - Rule the roost Meaning: To be in total control; to be the boss; to make all the decisions in a group. Example: My mother has always ruled the roost in our house. If you'd like to practice using this idiom, please write back to me on this post with an example and I'll tell you if you're using it correctly :D Finally, if you're looking for a friendly and patient teacher please check out my profile, my trial lessons start at $6. I look forward to meeting you. Thank you, Rianne :)