The verb refute means to prove that an argument, accusation, or theory is wrong or untrue.
Synonyms are discredit, contradict, disprove, or counter.
The word origins from Middle French réfuter (16th century) and directly from Latin refutare meaning “drive back, rebut, disprove, repress, repel, resist, oppose”. It comes from re– meaning “back” plus *futare meaning “to beat’’.
They strongly refuted her claims.
The defendant refuted the charges.
He utterly refutes any allegation from his former boss.