<p><strong>Noun</strong></p><ul><li>any of various viscid, amorphous exudations from plants, hardening on exposure to air and soluble in or forming a viscid mass with water.</li><li>any of various similar exudations, as resin.</li><li>a preparation of such a substance, as for use in the arts or bookbinding.</li><li>chewing gum.</li><li>mucilage; glue.</li><li>rubber.</li><li>gum tree.</li><li>the adhesive by which a postage stamp is affixed.</li><li>a rubber overshoe or boot.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>gummed</li><li>gumming</li><li>to smear, stiffen, or stick together with gum.</li><li>to clog with or as if with some gummy substance.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>gummed</li><li>gumming</li><li>to exude or form gum.</li><li>to become gummy.</li><li>to become clogged with a gummy substance.</li></ul><p><strong>Verb Phrase (Slang)</strong></p><ul><li>to spoil or ruin.</li></ul>