To deny the truth or validity of (a statement or statements).

To oppose (a person) by denying the truth or pertinence of a given statement.

To be contrary to (something).

(obsolete) To give an order contrary to (another order or wish), oppose (something).

(obsolete) To give an order contrary to one given by (another person), oppose or resist (someone).

(obsolete) To speak against; to forbid.