trick or treat

trick or treat idiom
A greeting by children asking for treats on Halloween and threatening to play a trick on those who refuse to give them. For example, The children went from house to house, shouting “Trick or treat!” [c. 1940]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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