spread like wildfire
Disseminate or circulate very quickly, as in The rumor about their divorce spread like wildfire. The noun wildfire means “a raging, rapidly spreading conflagration.” [c. 1800]
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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.