I. ˈ ̷ ̷ ̷ ̷| ̷ ̷ adjective
Etymology: button down, v.
: fastened down with buttons
a button-down collar on a man's shirt
II. adjective
or but·toned-down ˈbət ə n¦dau̇n
Etymology: from the fact that button-down shirts are felt to be conservative
: conservatively traditional or conventional ; especially : adhering to conventional norms in dress and behavior
button-down businessmen
III. ˈ ̷ ̷ ̷ ̷ ˌ ̷ ̷ noun
( -s )
: a shirt with a button-down collar