<p><strong>Adjective</strong></p><ul><li>overspread or covered with clouds; cloudy: an overcast day.</li><li>(of the sky) more than 95 percent covered by clouds.</li><li>dark; gloomy.</li><li>sewn by overcasting.</li></ul><p><strong>Noun</strong></p><ul><li>Meteorology: the condition of the sky when more than 95 percent covered by clouds.</li><li>Mining: a crossing of two passages, as airways, dug at the same level, in which one rises to pass over the other without opening into it.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to overcloud, darken, or make gloomy: Ominous clouds began to overcast the sky.</li><li>to sew with stitches passing successively over an edge, especially long stitches set at intervals to prevent raveling.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to become cloudy or dark: By noon it had begun to overcast.</li></ul>