Definition of watchdog noun from the Oxford Advanced American Dictionary

 

watchdog

 noun
noun
NAmE//ˈwɑtʃdɔɡ//
 
, NAmE//ˈwɑtʃdɑɡ//
 
 
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a person or group of people whose job is to check that companies are not doing anything illegal or ignoring people's rights a consumer watchdog “CERES” is a corporate watchdog group founded after the Exxon Valdez oil spill. compare guard dog
See the Oxford Advanced Learner's Dictionary entry: watchdog