The phrase "cave dwellers" refers to people who live or existed in caves. It can also be used metaphorically to describe individuals who are isolated, primitive, or less advanced in society. Full definition
S. Craig Zaher's violent treat follows a sheriff (Kurt Russell), his deputy (Richard Jenkins), a gunslinger (Matthew Fox), and a cowboy (Patrick Wilson) embark on a mission in the Old West to rescue three people from a savage group of cave dwellers. (vodzilla.co)
A nearly complete skull of a mysterious member of the human family was unveiled this week at the same time as researchers reported a surprisingly recent age for this ancient cave dweller in South Africa. (science.sciencemag.org)