Longman Dictionary of Contemporary English homepage

watchdog

 noun
     
Related topics: Business Basics, Officials
watch‧dog [countable]
1BBPGO a person or group of people whose job is to protect the rights of people who buy things and to make sure companies do not do anything illegal or harmful:
2 old-fashioned a guard dog
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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