watchdog

[woch-dawg, -dog]
noun
1.
a dog kept to guard property.
2.
a watchful guardian: a self-appointed watchdog of the public morals.
adjective
3.
of, pertaining to, or characteristic of a watchdog.
4.
organized or functioning as a watchful guardian, especially against illegal or unethical conduct: a watchdog group in the legislature.
verb (used with object), watchdogged, watchdogging.
5.
to watch carefully, especially so as to detect illegal or unethical conduct.

Origin:
1600–10; watch + dog

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
watchdog (ˈwɒtʃˌdɒɡ)
 
n
1.  a dog kept to guard property
2.  a.  a person or group of persons that acts as a protector or guardian against inefficiency, illegal practices, etc
 b.  (as modifier): a watchdog committee

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Think of it as a watchdog guarding against starvation by monitoring body fat.
But watchdog groups say that the system's reliance on self-reporting means its
  data are fundamentally flawed.
But the newspaper's watchdog on journalistic ethics missed the point.
Academia, with its left leaning views prides itself as a watchdog.
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