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

1.
denunciar, revelar, delatar
to inform on someone or something, especially to expose wrongdoing
:
•
An employee decided to blow the whistle on the company's illegal practices.
Um funcionário decidiu denunciar as práticas ilegais da empresa.
•
If you see any corruption, you should blow the whistle on it.
Se você vir alguma corrupção, deve denunciá-la.