<p><strong>Noun</strong></p><ul><li>an act or instance of lying concealed so as to attack by surprise: The highwaymen waited in ambush near the road.</li><li>an act or instance of attacking unexpectedly from a concealed position.</li><li>the concealed position itself: They fired from ambush.</li><li>those who attack suddenly and unexpectedly from a concealed position.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>to attack from ambush.</li></ul>