TUMBLEDOWN Meaning of TUMBLEDOWN in English tum ‧ ble ‧ down /ˈtʌmb ə ldaʊn/ BrE AmE adjective [only before noun] a tumbledown building is old and beginning to fall down:a tumbledown cottage Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012