The phrase "gave nod" refers to the act of acknowledging someone or something by nodding one's head. While there are no direct antonyms for this phrase, there are many opposite actions, such as shaking one's head or ignoring the person or matter altogether. These actions could represent disagreement, disapproval, or a lack of interest. Another antonym for "gave nod" could be actively addressing someone or something, such as speaking or making eye contact. Whatever the opposite may be, it is important to remember that acknowledging people and situations positively can have a great impact on our relationships and interactions.