ONSTAGE Meaning of ONSTAGE in English on ‧ stage /ˌɒnˈsteɪdʒ◂ $ ˌɑːn-. ˌɒːn-/ BrE AmE adjective , adverb on the stage in a theatre OPP offstage :Even today I get nervous before I go onstage. Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012