The word "sidelined" is commonly used to describe someone or something that has been set aside or pushed aside from the main action or task. There are a number of synonyms that can be used to express a similar idea, including "benched," "decommissioned," "relegated," "exiled," "ostracized," "marginalized," and "superseded." These words can be used in a number of contexts, from sports and politics to business and personal relationships. Each word has its own connotations and shades of meaning, allowing writers and speakers to choose the best word to convey their intended message.