"Toss away" is an informal phrase that means to discard something casually. There are several synonyms that can be used to convey the same idea, such as "throw away," "discard," "get rid of," "junk," "trash," "chuck," "dump," "ditch," or "jettison." These terms can be used interchangeably in different contexts. For example, one might say, "I need to toss away these old clothes" or "I'm going to throw away this paper." Similarly, one might say "I'm getting rid of this old sofa," or "I'm going to dump these useless tools." Overall, there are countless ways to express the idea of "tossing away" something that is no longer needed.