The phrase "couple on" can have various synonyms, depending on the context and the usage of the term. Some of the common synonyms for the phrase "couple on" include "pair up" or "team up," which are used when two individuals are collaborating or working together on a specific task or project. Other synonyms for "couple on" include "hook up," which is a more casual term used to describe two individuals who are romantically involved, and "pair off," which is used to describe two people who are paired together for a specific purpose, such as a dance or a game. Regardless of the context, the phrase "couple on" has a wide range of synonyms that can be used to convey a similar meaning.