Akademik

button-down
adjective
1. unimaginatively conventional (Freq. 1)
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"a colorful character in the buttoned-down, dull-grey world of business"- Newsweek

• Syn: ↑buttoned-down, ↑conservative
• Similar to: ↑conventional
2. of a shirt; having the ends of the collar fastened down by buttons
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Brooks Brothers button-down shirts

• Similar to: ↑buttoned, ↑fastened

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ˌbutton-ˈdown [button-down] adjective
a button-down ↑collar, shirt, etc. has the ends of the ↑collar fastened to the shirt with buttons

Useful english dictionary. 2012.