The antonyms of the word "over-throw" are words that have opposite meanings. One antonym is "support," which means to hold or bear up, offering assistance or encouragement. Another antonym is "uphold," which means to affirm or support with conviction or evidence. "Protect" is also an antonym, meaning to guard from harm, loss or injury. A fourth antonym is "sustain," which means to maintain or keep going. Lastly, "maintain" is an antonym for "over-throw" that means to keep in its original state, preserve, or continue without interruption. These antonyms can be used in various contexts depending on the sentence and intended meaning.