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watchdog (n.)

also watch-dog, c. 1600, from watch (v.) + dog (n.). Figurative sense is attested by 1845.

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Definitions of watchdog from WordNet

watchdog (n.)
a guardian or defender against theft or illegal practices or waste;
she is the global watchdog for human rights abuses
watchdog (n.)
a dog trained to guard property;
Synonyms: guard dog
From wordnet.princeton.edu