The phrase "cast out" can be replaced with many different synonyms depending on the intended usage. If you wanted to suggest expulsion or banishment, you could use words like "exile," "banish," "ostracize," or "oust." On the other hand, if you were looking to convey a sense of rejection or abandonment, words like "discard," "dismiss," "reject," or "shun" might be more appropriate. There are a wide variety of synonyms for "cast out" beyond these examples, ranging from formal and academic to slang and colloquial. Understanding the nuances of each synonym can help you communicate more effectively and precisely in a variety of contexts.