The term 'prohibit legally' can be summarized by two crossword solutions: ENJOIN (6 letters) and ESTOP (5 letters). ENJOIN is a legal term meaning to order or command someone to do something, or to forbid someone from doing something. ESTOP is a legal term meaning to prevent someone from doing something, or to stop someone from taking a certain action. Both terms are used in the context of prohibiting someone from doing something legally.