The phrase "knock senseless" is used to describe a physical blow that causes the recipient to lose consciousness or become disoriented. There are several synonyms for this phrase that convey the same meaning, including "knockout," "beat into submission," "render unconscious," "knock silly," and "lay out." These terms are commonly used in sports, particularly boxing and mixed martial arts, to describe a powerful punch that incapacitates an opponent. However, they can also be used in more general contexts to describe any situation in which a person is overwhelmed or defeated by a physical or emotional blow. Whether used literally or figuratively, these phrases emphasize the force and impact of the action being described.