Used to describe someone observing critically, often to maintain integrity or ethical standards. She is the classroom watchdog, ensuring students follow the honor code during exams.
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Figurative Guardian
Implies a protective role, safeguarding the public interest or wellbeing. Consumer rights groups serve as watchdogs, policing unfair business practices.
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Active Oversight
This role is proactive, actively seeking and exposing problems, not just responding to them. As a watchdog, the committee proactively audits accounts to prevent embezzlement.