throw a party
Put on or hold a social gathering, as in They're throwing a party to introduce their nephew to the neighbors, or She threw a party every Saturday night. [Colloquial; first half of 1900s]
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The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.