The antonyms for the phrase "knock unconscious" are quite straightforward. The words "awaken", "revive", "rouse", "energize", and "stimulate" can be used to convey the opposite meaning. These antonyms suggest a state of being alert, conscious, and active, whereas "knock unconscious" implies a loss of consciousness or awareness. They can be used in various contexts, such as medicine, sports, and everyday life situations. For instance, a medical expert may use them when prescribing medication while an athlete may use them to describe how they feel after a strenuous workout. All in all, antonyms are essential vocabulary tools for expressing opposite meanings of words.