Set up is a versatile phrase that describes a number of actions. It can mean to arrange, organize, or position objects or people, or to establish or start a business or project. There are several alternative phrases or synonyms that can be used in place of set up, depending on the context. These include install, assemble, erect, position, build, establish, launch, initiate, create, and prepare. It is important to choose the right synonym for the specific situation in order to convey the intended meaning. By using synonyms, you can add variety to your writing and make your message clearer and more interesting.