blow the whistle on
US /bloʊ ðə ˈhwɪs.əl ɑn/
UK /bloʊ ðə ˈhwɪs.əl ɑn/

1.
폭로하다, 고발하다, 내부 고발하다
to inform on someone or something, especially to expose wrongdoing
:
•
An employee decided to blow the whistle on the company's illegal practices.
한 직원이 회사의 불법 행위를 폭로하기로 결정했다.
•
If you see any corruption, you should blow the whistle on it.
부패를 보면 고발해야 한다.