I. noun Date: 1612 a dog kept to guard property, one that guards against loss, waste, theft, or undesirable practices, II. transitive verb Date: 1902 to act as a ~ for
WATCHDOG
Meaning of WATCHDOG in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012