steam·roll·er / ˈstēmˌrōlər/ • n. a heavy, slow-moving vehicle with a roller, used to flatten the surfaces of roads during construction. ∎ fig. an oppressive and relentless power or force: victims of an ideological steamroller.• v. (also steam·roll) [tr.] (of a government or other authority) forcibly pass (a measure) by restricting debate or otherwise overriding opposition: they would have to work together to steamroller the necessary bills past the smaller parties. ∎ force (someone) into doing or accepting something: an attempt to steamroller the country into political reforms. ∎ [intr.] proceed forcefully and seemingly invincibly: they steamrolled through the playoffs undefeated.