прилагательное 1) с концами, застёгивающимися на пуговицы (о воротнике) 2) смотри значение buttoned-down
I. adjective 1. a. of a collar having the ends fastened to the garment with buttons b. of a garment having a button-down collar 2. (or buttoned-down) conservatively traditional or conventional; especially adhering to conventional norms in dress and behavior Example: button-down businessmen II. noun a shirt with a button-down collar