out coldUNCONSCIOUS informal unconscious 不省人事 He drank until he was out cold. 他一直喝到不省人事。
You were knocked out cold (=hit on the head so that you became unconscious). 你被打昏了。
knocked out cold• The seaman had been knocked out cold, helped considerably by the cider no doubt.
→ out cold at cold3(1)