The term DEVIATE FROM A COURSE can be summarized as changing direction or straying from a predetermined path. The crossword solutions for this term are YAW (3 letters) and SHEER (5 letters). YAW is a nautical term that refers to the turning of a ship from its course, while SHEER is an adjective meaning abrupt or complete. Together, these two words describe the act of deviating from a course, which is to turn away from a predetermined path.