[{"Bold_text": "noun", "List Items": ["an act or instance of lying concealed so as to attack by surprise:The highwaymen waited in ambush near the road.", "an act or instance of attacking unexpectedly from a concealed position.", "the concealed position itself:They fired from ambush.", "those who attack suddenly and unexpectedly from a concealed position."]}, {"Bold_text": "verb (used with object)", "List Items": ["to attack from ambush."]}]