a sheet or page torn from a magazine, journal, or the like, as one containing an advertisement and sent to the advertiser as proof of publication.
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British Dictionary definitions for tear sheet
a page in a newspaper or periodical that is cut or perforated so that it can be easily torn out
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