Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A dog trained to guard people or property.
  • noun One who serves as a guardian or protector against waste, loss, or illegal practices.

from The Century Dictionary.

  • noun A dog kept to watch or guard premises and property.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A dog kept to watch and guard premises or property, and to give notice of the approach of intruders.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun a guard dog
  • noun a person or organization that monitors and publicizes the behavior of others (individuals, corporations, governments) to discover undesirable activity.
  • verb To perform a function analogous to a watchdog.
  • verb To guard and warn.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a guardian or defender against theft or illegal practices or waste
  • noun a dog trained to guard property

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From watch and dog.

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