trick-or-treat

Trick-or-treating is a Halloween custom for children in many countries. Children in costumes travel from house to house asking for treats such as candy (or, in some cultures, money) with the phrase "Trick or treat". The "trick" is a (usually idle) threat to perform mischief on the homeowners or their property if no treat is given to them. It typically happens during the evening of October 31. Some homeowners signal that they are willing to hand out treats, for example by putting up Halloween decorations outside their door. Others might simply leave treats on their porch.