<p><strong>Verb</strong></p><ul><li>to stare with open mouth, as in wonder.</li><li>to open the mouth wide involuntarily, as the result of hunger, sleepiness, or absorbed attention.</li><li>to open as a gap; split or become open wide.</li></ul><p><strong>Noun</strong></p><ul><li>a wide opening; gap; breach.</li><li>an act or instance of gaping.</li><li>a stare, as in astonishment or with the mouth wide open.</li><li>a yawn.</li><li>Zoology. the width of the open mouth.</li></ul>