The phrase "go-devil" is most commonly used as a colloquial term for a small boat motor that is attached to the transom of a boat. However, there are several synonyms for the term that can be used interchangeably depending on the context. These synonyms include "outboard motor," "boat engine," "marine propulsion system," and "boat motor." Each of these phrases refers to the same type of motor that is used to propel a boat through the water. Regardless of the term used, these engines are an essential component for any recreational boater who wants to travel on the water with speed and ease.