snap on

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释义
扣上；别上
attached or fitting into place by means of a snap or with a pressing motion:

例句
Roy: Next thing, he's cramming for the bar at Bryn Mawr,and snapping on a flag pin.（House of Cards）
接着他就跑去布林茅尔为考律师埋头苦学。之后，还别上了国旗胸针。（纸牌屋）