The term 'Leave the Straight and Narrow' is a phrase that has been used for centuries to refer to someone who is straying from the path of righteousness. The crossword solutions for this phrase are ERR (3 letters) and STRAY (5 letters). ERR means to make a mistake or do something wrong, while STRAY means to wander away from the right course or path. Therefore, the phrase 'Leave the Straight and Narrow' can be interpreted as someone who is making mistakes or wandering away from the path of righteousness.