get knocked out cold

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get knocked out cold

To be rendered unconscious, as by a physical blow, medication, or other means. I had a shot at a championship boxing title, but I got knocked out cold in the semi-finals. I hope I don't get knocked out cold by this painkiller the doctor gave me. Sam drank a bit too much on her 21st birthday and got knocked out cold by 10 PM.
See also: cold, get, knock, out