"The cold shoulder" is a phrase that has been around for centuries and describes the act of deliberately ignoring or showing disinterest towards someone. If you are looking to diversify your vocabulary and express this act in a unique way, consider using synonyms such as "give someone the brush-off," "snub," "ignore," "neglect," "disregard," or "exclude." These words all convey the sentiment of being intentionally avoided or rejected by someone. Other alternatives include "dismiss," "spurn," "cut off," "shun," and "sideline." Whatever word you choose, it's important to remember that any form of social rejection can be hurtful and have a negative impact on someone's emotional well-being.