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puff piece

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noun Informal.

a newspaper article, book, public-relations film, etc., whose purpose is to praise or flatter.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for puff piece

puff piece

noun

a flattering newspaper or magazine article about a person or an organization
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Idioms and Phrases with puff piece

puff piece

An approving or flattering article, as in That was really a puff piece about the conductor, written by her cousin. The use of puff for “exaggerated praise” dates from about 1600; piece was added in the mid-1900s.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.