<p><strong>Noun</strong></p><ul><li>A coat or jacket worn under another.</li><li>Zoology. A growth of short fur or hair lying beneath a longer growth.</li><li>An undercoating.</li><li>A coat of paint or the like applied under the finishing coat.</li><li>A paint, sealer, or the like specially prepared for use underneath a finishing coat.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) To apply an undercoating to.</li></ul>