trousers UK /ˈtɹaʊzəz/US /ˈtɹaʊzɚz/noun 1phrases 3 noun[plural only]1 •clothes that cover each leg on its own, reaching from the middle of the body to the feet or kneesThe trousers need to be shortened. Phrases with trousers all mouth and trousersSuperficial, engaging in empty, boastful talk, but not of real substance. in short trousersIn childhood; as a child; when quite young (including nonliterally, e.g., as a young adult). wear the trousersTypically of a woman, to be the dominant partner in a relationship.