The term LEG HINGE can be broken down into two parts: the word 'LEG' and the word 'HINGE'. The term 'LEG' refers to the lower limb of a human body, while the term 'HINGE' is a mechanical device that allows two objects to pivot or rotate around a fixed point. The crossword solution for the term LEG HINGE is KNEE, which is a joint in the human body located between the thigh and the lower LEG. The KNEE is a type of HINGE joint that allows the LEG to bend and straighten.