noun
a person or group that monitors and oversees the actions of others, especially in a regulatory or supervisory capacity
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The watchdog organization is responsible for monitoring the financial activities of the company.
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My neighbor's dog is a great watchdog, always barking at any strangers approaching the house.
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I heard that new security system is a real watchdog, keeping an eye on everything happening in the neighborhood.
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The media serves as a watchdog, holding those in power accountable for their actions.