CONTRADICT

[verb] [T] - (of people) to state the opposite of what someone else has said, or (of one fact or statement) to be so different from another fact or statement that one of them must be wrongIf you're both going to lie, make sure you get the story the same and don't contradict each other!What's the matter with you today! Everything I say you seem to want to contradict.Did you notice the way he kept contradicting himself when we were arguing? I think he was a bit confused.How dare you contradict (him)! [I or T]Recent evidence has tended to contradict established theories on this subject. [T]