watchdog

Từ điển Oxford Advanced Learner 8th

watch·dog [watchdog watchdogs] BrE [ˈwɒtʃdɒɡ] NAmE [ˈwɑːtʃdɔːɡ] noun
a person or group of people whose job is to check that companies are not doing anything illegal or ignoring people's rights
•a consumer watchdog
•‘Ofwat’ is the water industry watchdog in Britain.
compare ↑guard dog

Culture:
In Britain the word watchdog is often used of organizations set up by the government to make sure that the actions of former public companies and institutions which became privately owned in the 1980s and 1990s are both legal and fair.

Example Bank:
•a consumer watchdog for transport
•an independent watchdog for civil rights
•an unofficial watchdog of pesticide use
•reporters who do the real work of watchdog journalism
•the government's official watchdog on nature conservation
•She is a member of the consumer watchdog for transport in London and Southern England.