trick or treat

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++ˌtrick or ˈtreat verb  1. go trick or treating DGif children go trick or treating, they dress in costumes and go from house to house on Halloween saying ‘trick or treat’ in order to get sweets 去讨糖〔指万圣节前夜小孩子穿上化装服挨家挨户去讨糖吃〕2. the words that children say when they go trick or treating, to say that they will play a trick on someone if they are not given a treat (=sweet) 不给糖就捣乱〔万圣节前夜小孩子上门讨糖吃时说的话〕→ See Verb table

ˌtrick or ˈtreat verbChineseSyllable  

Corpus trick children they dress if go or treating,

trick or treat
ˌtrick or ˈtreat verb
1. go trick or treating if children go trick or treating, they dress in costumes and go from house to house on Halloween saying ‘trick or treat’ in order to get sweets
2. the words that children say when they go trick or treating, to say that they will play a trick on someone if they are not given a treat (=sweet)

●ˌtrick or ˈtreatsaid by children who visit people's houses at Halloween and threaten to play tricks on people who do not give them sweets/candy 是请吃糖，还是想遭殃（万圣节时儿童挨家索要糖果用语，扬言若不给糖就捣乱戏弄别人）