There are plenty of synonyms for the phrase "drop out," each describing the act of leaving school or a program of some kind. Some of the most common include "quit," "withdraw," "abandon," "resign," "forsake," and "give up." Other synonyms might include "bow out," "depart," "surrender," "cede," "relinquish," "back out," and "retreat." Depending on the context, different synonyms might be more appropriate - for example, "forsake" might imply more of a deliberate abandonment or rejection of something, while "withdraw" might suggest a more passive disconnection. Regardless of the synonym used, "drop out" generally refers to someone leaving an institution or program before it's completed or finished in some way.