The fierce public and scholarly debate over trigger warnings in university classrooms has often characterized the issue as one of academic freedom and ignored the social justice arguments for trigger warnings. In this essay, we argue that trigger warnings expand academic speech by engaging students more fully in their own learning. Specifically, we understand trigger warnings as a means of respecting students' intellectual, emotional, and physical boundaries. By framing trigger warnings in this way, we argue that they are tools of worldmaking to the degree that they promise to improve accessibility, engage students better in learning, and cultivate more socially just and livable campuses.