watchdog

US /ˈwɑːtʃ.dɑːɡ/
UK /ˈwɑːtʃ.dɑːɡ/
"watchdog" picture
1.

a dog kept to guard property

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The farmer relied on his loyal watchdog to protect the livestock.
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We need a good watchdog for our property.
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guard dogalert dog
2.

a person or group that monitors the activities of an organization or person to ensure that they are not doing anything illegal or wrong

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The consumer watchdog group exposed the company's deceptive advertising practices.
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An independent watchdog was appointed to investigate the allegations.
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monitorregulatoroversight bodycustodian