speak out against something

Từ điển Oxford Advanced Learner 8th

ˌspeak ˈout (against sth) derived
to state your opinions publicly, especially in opposition to sth and in a way that takes courage
• He was the only one to speak out against the decision.
• I will continue to speak out on matters of public concern.
see also ↑outspoken
Main entry: ↑speak_derived