stag night/party       
noun [ C ] uk/ˈstæɡ ˌnaɪt/ us/ˈstæɡ ˌnaɪt/ (US also bachelor party)
 (只邀请男性朋友参加的)男子婚前聚会,单身告别聚会
a party for a man who is going to get married, to which only his male friends are invited
 Compare: hen night 
 
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