speak out of turn

Từ điển Oxford Advanced Learner 8th

▪ I. ˌspeak out of ˈturn idiom
to say sth when you should not, for example because it is not the right time or you are not the right person to say it
Main entry: ↑speak_idiom
 
▪ II. speak/talk ˌout of ˈturn idiom
to say sth that you should not because it is the wrong situation or because it offends sb
Main entry: ↑turn_idiom