There are several synonyms for the phrase "something for nothing" which generally refers to getting a benefit without having to put in any effort. Some of the common synonyms of this phrase include free lunch, easy money, gravy train, handout, and freeloading. These synonyms often carry negative connotations and suggest that the person receiving the benefit is taking advantage of a situation or exploiting others for personal gain. It is important to note that there is rarely such a thing as "something for nothing" and that any benefit typically comes with a cost or trade-off.