Expressions used in Everyday Spoken English in Social and Professional contexts
The phrasal a verb 'knock out' has several meanings. To knock out a person means to render them unconscious with the use of drugs or physical violence. In boxing, a knock out signals the end of a boxing match when one competitor cannot get up within a specific time. As an adjective, someone who is described as a knock out is someone who is extremely physically attractive or appealing. In science, knock out can refer to a gene which is removed or inactivated with genetic engineering. If you produce something quickly or roughly, you can use knock out for example, 'we knocked out a prototype quickly over the weekend'. Knock out can also mean to make something useless or unable to work. To knock out can also mean to eliminate or remove something or someone such as getting knocked out of the game. If you say you are knocked out it can also mean you feel extremely tired or exhausted.