Knock senseless is a phrase that describes the act of rendering someone unconscious or unable to think clearly. This can be done in various ways, such as stunning, flooring, concussing, and dazing. Stunning is the act of temporarily paralyzing someone with a shock or blow, while flooring is the act of knocking someone to the ground. Concussing is the act of causing a concussion, which is a type of traumatic brain injury, and dazing is the act of disorienting someone with a sudden shock or blow. All of these acts can be used to knock someone senseless.