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dog tag

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noun
  1. a small disk or strip attached to a dog's harness or collar stating owner, home, etc.
  2. identification tag.
  3. Informal.
    1. any tag for a suitcase, camera, or other personal possession with the owner's name or address.
    2. a tag or card with a person's name or affiliation, worn at conventions, large meetings, etc.
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Origin of dog tag

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for dog tags

dog tag

noun
  1. US slang a military personal-identification disc
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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