Watchdog

A watchdog originally referred to a dog that is intended to keep watch, to warn of possible trouble at the approach of strangers or animals. It has been used in additional contexts with the same implication of watching or safeguarding:

For the dog's job, see guard dog.
In computer programming there are watchdog timers.
A watchdog is also an informal name given to consumer protection organisations or campaigners. Their aim is to highlight criminality and poor service provided by companies and public bodies. In the UK, there is a long-running BBC TV programme called Watchdog that fills such a role.

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fr:chien de garde

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