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Meaning of button-down

but•ton-down

Pronunciation: (but'n-doun"), [key]
— adj.
  1. (of a shirt collar) having buttonholes so it can be buttoned to the body of the shirt.
  2. (of a shirt) having a button-down collar.
  3. (esp. of attitudes, opinions, etc.) extremely conventional; unimaginative.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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