button-down

== English == === Alternative forms === buttoned-down === Pronunciation === === Adjective === button-down Of a collar, able to be buttoned down to the shirt, as over a necktie. (idiomatic) Serious; staid; businesslike. (idiomatic) Conservative; conventional; unimaginative. === Noun === button-down (plural button-downs) A shirt with a button-down collar (colloquial) A button-up shirt