What does Buffalo chest mean?

Buffalo chest meaning in Medical Dictionary

A single upper body cavity with no anatomic separation associated with the two hemithoraxes because of, including, to tension pneumothorax (air under pressure collapsing a lung). Its called buffalo upper body as this anatomical peculiarity for the North American buffalo, or bison, assisted the Indians associated with Great Plains to eliminate them. An individual Indian arrow into chest usually had been enough to allow atmosphere into collapse both lungs and dropped the breathless bison.