"Coldcocked" means to knock somebody unconscious with a punch or a blow. Some synonyms for this word include knocked out, floored, levelled, laid out, flattened, KOed, and put to sleep. Each of these terms describes the act of rendering someone unconscious with a single punch or hit. While these words may differ in their connotations, they all mean the same thing, which is to knock someone out cold. To use these words effectively, it's important to consider the context in which they are used as they can all have different shades of meaning. Overall, these synonyms provide a range of ways to describe the same physical act of incapacitating someone with a single hit.