Disrespectful, pejorative, and vulgar speech has become a widespread threat to the deliberative potential of today’s online discourses. Yet, while platforms often fail to moderate uncivil content properly, ordinary users increasingly take on responsibility for a functional discourse online. Thus, the present study builds on the concept of online civic intervention (OCI), which is defined as actions taken by users to fight disruptive online behavior. This study follows a dynamic perspective and aims to investigate how OCI emerges, diffuses, and persists as a discourse norm over time.