What is knuckle dragging meaning?

Knuckle dragging is an idiomatic expression used to describe a behavior or physical trait that is perceived as primitive or uncivilized. The term describes the behavior of walking on all fours or using the hand's knuckles to support oneself while walking. It has been used as a derogatory term to describe people who are seen as backward or undeveloped and is considered offensive. This term is also used in physiology, where knucklewalking is a form of bipedalism that animals like chimpanzees, gorillas, and orangutans use.