<p><strong>Adjective</strong></p><ul><li>plumper, plumpest</li><li>well filled out or rounded in form; somewhat fleshy or fat</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to become plump (often followed by up or out)</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to make plump (often followed by up or out): to plump up the sofa pillows</li></ul>