speak ill of somebody

Từ điển Oxford Advanced Learner 8th

▪ I. speak/think ˈill of sb idiom
(formal)to say or think bad things about sb
•Don't speak ill of the dead.
Main entry: ↑ill_idiom
 
▪ II. speak ˈwell/ˈill of sb idiom
(formal)to say good or bad things about sb
•She never speaks ill of anyone.
Main entry: ↑speak_idiom