trick-or-treating
noun [ U ] uk/ˌtrɪk.ɔːˈtriː.tɪŋ/ us/ˌtrɪk.ɔːrˈtriː.t̬ɪŋ/
不款待就捣蛋（每年10月31日万圣节这天孩子们身着吓人或怪异的衣服上门索要糖果或少量钱财）
an activity in which children dress up as magical or frightening creatures or as characters from a story on Halloween (= 31 October ), and visit people's homes to demand sweets
go trick-or-treating 参加“不款待就捣蛋”的万圣节活动
If children go trick-or-treating, they visit people's houses on Halloween to ask for sweets.