1to fasten
2to button
3button
4buckle
5knot
6to arrest
7to confiscate
8to deduct (money)
9discount
10to knock
11to smash, spike or dunk (a ball)
12to cover (with a bowl etc)
13(fig.) to tag a label on sb
14(Tw) (loanword) code
Examples
nǐ你de的chèn shān衬衫méi没xì系shàng上kòu扣zǐ子。
你的衬衫没系上扣子。
Your shirt is unbuttoned.
他老是给别人扣帽子。
He's always putting labels on people.
包裹被海关扣了。
The package was confiscated by customs.