Pronunciation: (but'n-doun"), [key]
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. Also,but'toned-down'.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.