ALL meanings of button down
but·ton down
B b - adjective button down (of a shirt collar) having buttonholes so it can be buttoned to the body of the shirt. 1
- adjective button down (of a shirt) having a button-down collar. 1
- adjective button down (of a shirt) having buttons down the front from the collar to the bottom. 1
- adjective button down Also, buttoned-down. (especially of attitudes, opinions, etc.) extremely conventional; unimaginative. 1