watchdog noun
ADJ. consumer | financial, health, industry, pollution, safety | government, independent, official
VERB + WATCHDOG act as, be
WATCHDOG + NOUN body, group, organization | role
PREP. ~ for a consumer watchdog for transport | ~ on the government's official watchdog on nature conservation | ~ over The committee acts as an independent watchdog over government spending.
You can also check other dicts: watchdog (English, 中文解释 ), wordnet sense, Collins Definition