The crossword solution for the term STAND ON HIND LEGS is REAR, which is a four-letter word. The term STAND ON HIND LEGS refers to an animal behavior in which the animal stands on its hind legs, usually as a form of communication or to gain a better view of its surroundings. This behavior is most commonly seen in primates, such as chimpanzees and gorillas, but can also be seen in some other animals, such as bears and dogs.