<p><strong>Noun</strong></p><ul><li>a rapid movement of troops from a besieged place to attack the besiegers.</li><li>a body of troops involved in such a movement.</li><li>the flying of an airplane on a combat mission.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to go on a sortie; sally forth.</li></ul>