The phrase "to rig up" means to prepare or set something up in a way that is suitable for use. It can refer to assembling and arranging equipment, tools or materials needed to perform a task or complete a project. The term comes from nautical terminology where it refers to the act of readying a sailboat for sailing by raising its sails and adjusting them properly. Today, "to rig up" is used in various contexts such as setting up an electrical system, assembling furniture or putting together a machine.