button-down

• buttoned-down

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button-down

1. Of a collar, able to be buttoned down to the shirt, as over a necktie.
2. (idiomatic) Serious; staid; businesslike.
3. (idiomatic) Conservative; conventional; unimaginative.

button-down (plural button-downs)

1. A shirt with a button-down collar
   • 2011, Dan McNeil, “Doesn't take long for Guillen to be irrelevant in Chicago”, in Chicago Tribune:

     Wearing a stylish pink button-down with white pinstripes, Ozzie Guillen beamed about feeling like he had "come home" when he was presented Wednesday as the manager of the Miami Marlins.