The phrase "work both ways" implies that something is reciprocated or mutually beneficial. There are several other ways to express this idea using synonyms. For example, "mutually advantageous" conveys a sense of cooperation and equal benefit. "Two-way street" is a common expression that denotes both parties being able to contribute equally. "Reciprocity" suggests a give-and-take relationship. "Mutual benefit" highlights the advantages on both sides. Additionally, the phrases "win-win situation" and "mutual gain" demonstrate that both parties benefit in a situation. No matter how it is expressed, the concept of mutual benefit is essential in any positive relationship or interaction.