"Gave the nod" is an idiomatic expression that refers to giving approval or agreement to someone or something. The antonyms of this expression can be "denied," "opposed," or "rejected." Denying the nod means to disapprove or withhold approval, while opposing the nod means to be against the decision or action taken. Similarly, rejecting the nod means to disagree or refuse to accept the proposal. These antonyms suggest a lack of agreement, dissent, or opposition to the approval or agreement conveyed by "giving the nod." It is important to understand these antonyms in order to express opinions and decisions more accurately and effectively.