The phrase "toss out" has various antonyms that can be used in different contexts based on the meaning that needs to be conveyed. Some of the antonyms include "keep," "save," "store," "hoard," "cherish," "treasure," "retain," "preserve," "protect," and "conserve." While "toss out" implies getting rid of something, "keep" and "save" denote the act of retaining things for future use. "Hoard" has a slightly negative connotation as it points towards an excessive accumulation of items. "Cherish" and "treasure" signify valuing something, and "preserve," "protect," and "conserve" relate to safeguarding or maintaining something from damage or destruction.