watchdogEnglishOxford American Thesauruswatchdog noun 1 they use watchdogs and armed guards to ward off trespassers: guard dog, house dog. 2 the department acts as a watchdog over life insurance companies | a consumer watchdog: ombudsman, monitor, scrutineer, inspector, observer, supervisor; custodian, guardian, guard, protector.
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EnglishOxford American Thesaurus