Definition of trick or treat noun from the Oxford Advanced American Dictionary

 

trick or treat

 noun
noun
 
[uncountable]
 
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a custom on Halloween when children wear costumes and visit people's houses and saytrick or treatto ask for candy
trick-or-treatingnoun[uncountable]
 
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to go trick-or-treating
See the Oxford Advanced Learner's Dictionary entry: trick or treat