Wiktionary
vb. To extort small treats on Halloween by implied threat of property damage or practical joke.
Usage examples of "trick-or-treat".
He drove on toward Natick and Framingham, and Eastborough beyond, and he could not help but think of Halloween, of trick-or-treating, and raking frosted leaves with his dad, who had always waited late in the season to do the job.
In my youth, trick-or-treat escapades were tame: soaped windows, upset trash cans, demounted garden gates, toilet-paper festoons on shrubs and — in the case of notorious neighborhood ogres — walks and porches defiled with smashed jack-o'-lanterns and rotten eggs.
Hall was mean for giving homework on Fridays, all the ways Debra Gilhooly had of being such a bitch, how she and Pepsi had planned to go trick-or-treating as Spice Girls last Halloween and Mom had said Pepsis Mom could do whatever she wanted, but no nine-year-old girl of hers was going out trick-or-treating in a short skirt, high heels, and a cammi top.