<p><strong>Verb (used with object):</strong></p><ul><li>To elevate in character; sublimate.</li><li>To make (the mind, senses, etc.) keen or discerning; sharpen.</li><li>To introduce subtleties into or argue subtly about.</li><li>To make thin, rare, or more fluid or volatile; refine.</li></ul><p><strong>Verb (used without object):</strong></p><ul><li>To make subtle distinctions or to argue subtly.</li></ul>