Attribute to someone, especially a wrongdoing or crime. For example, They pinned the murder on the wrong man. This expression uses pin in the sense of “attach.” [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.