trick or treat!trick or treat
traditional greeting used by a trick-or-treater: orig. used with the meaning “give me a treat or I will play a trick on you!”
intransitive verbtrick-or-treat·ed, trick-or-treat·ing, trick-or-treats
To engage in the practice of asking for treats on Halloween and threatening to play tricks on those who refuse.
trick or treat
Used as a greeting when trick-or-treating.