Quotidian disruption refers to the breakdown or interruption of everyday practices, routines, and expectations which leads to a heightened likelihood of the emergence of collective action. The word “quotidian” means the routines of daily life, and encompasses the everyday practices we all take for granted. A modern variant of breakdown theory, the central argument of the quotidian disruption model, proposed first by Snow and colleagues, is that actual or threatened disruption of the quotidian is the key element which connects social breakdown to movement emergence.