Watchdog (noun)

A person or organization that is responsible for monitoring or checking the behavior or performance of another person, group, or organization.

Origin:

The word 'watchdog' comes from the combination of 'watch' and 'dog', indicating that this person or organization is keeping a watchful eye on things.

Examples:

1. The government watchdog has expressed concern about the lack of transparency in the allocation of funds.
2. The watchdog was appointed to keep an eye on the activities of the company.
3. The watchdog group is responsible for ensuring that the charity is using its funds appropriately.
4. The watchdog agency is tasked with ensuring that government agencies are following the rules and regulations.
5. The watchdog has been working hard to monitor the compliance of companies with environmental regulations.