blow the whistle on

US /bloʊ ðə ˈhwɪs.əl ɑn/
UK /bloʊ ðə ˈhwɪs.əl ɑn/
"blow the whistle on" picture
1.

揭发, 告发, 告密

to inform on someone or something, especially to expose wrongdoing

:
An employee decided to blow the whistle on the company's illegal practices.
一名员工决定揭发公司的非法行为。
If you see any corruption, you should blow the whistle on it.
如果你看到任何腐败,你应该揭发它。