Definition of watchdog noun from the Oxford Advanced Learner's Dictionary

 

watchdog

 noun
noun
BrE BrE//ˈwɒtʃdɒɡ//
 
; NAmE NAmE//ˈwɑːtʃdɔːɡ//
 
 
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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 ‘Ofwat’ is the water industry watchdog in Britain. compare guard dog Culture In Britain the word watchdog is often used of organizations set up by the government to make sure that the actions of former public companies and institutions which became privately owned in the 1980s and 1990s are both legal and fair.Extra examples a consumer watchdog for transport an independent watchdog for civil rights an unofficial watchdog of pesticide use reporters who do the real work of watchdog journalism the government’s official watchdog on nature conservation She is a member of the consumer watchdog for transport in London and Southern England.
See the Oxford Advanced American Dictionary entry: watchdog