<p><strong>Noun</strong></p><ul><li>any of numerous small Old World rodents of the family Muridae, especially of the genus Mus, introduced widely in other parts of the world.</li><li>any similar small animal of various rodent and marsupial families.</li><li>a quiet, timid person.</li><li>a palm-sized, button-operated pointing device that can be used to move, select, activate, and change items on a computer screen.</li><li>a swelling under the eye, caused by a blow or blows; black eye (Informal).</li><li>a girl or woman (Slang).</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to hunt out, as a cat hunts out mice.</li><li>to secure with a mousing (Nautical).</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to hunt for or catch mice.</li><li>to prowl about, as if in search of something: The burglar moused about for valuables.</li><li>to seek or search stealthily or watchfully, as if for prey.</li><li>to use a mouse to move the cursor on a computer screen to any position.</li></ul>