<p><strong>Noun</strong></p><ul><li>A heavy steam-powered vehicle having a roller for crushing, compacting, or leveling materials used for a road or the like.</li><li>(Not in technical use) Any similar vehicle with a roller.</li><li>An overpowering force, especially one that crushes all opposition with ruthless disregard for individual rights.</li></ul><p><strong>Verb</strong></p><ul><li>(Used with object) To crush or flatten with a steamroller.</li><li>To overcome with superior force: to steamroller the competition.</li><li>To bring about the adoption of by overwhelming pressure: to steamroller the resolution through.</li><li>(Used without object) To proceed with implacable force.</li></ul><p><strong>Adjective</strong></p><ul><li>Suggestive of a steamroller; ruthlessly overpowering: steamroller tactics.</li></ul>