Meaning of “contradict” - Learner’s Dictionary

contradict

verb uk us /ˌkɒntrəˈdɪkt/
DIFFERENT [ T ]

If two things that are said or written about something contradict each other, they are so different that they cannot both be true:

His account of the accident contradicts the official government report.
DISAGREE [ I, T ]

to say that what someone else has just said is wrong:

He said we were all happy at work, and nobody dared to contradict him.

(Definition of “contradict” from the Cambridge Learner’s Dictionary © Cambridge University Press)