The antonyms for the word "over-throws" can be seen as reinforcements, support, and strengthening. These terms refer to the opposite of overthrowing a particular idea, concept, or regime. Reinforcements, for instance, suggest adding more power or aid to the existing system. Support pertains to underpinning and the provision of necessary resources to help an existing system operate at its optimal level. Strengthening relates to the act of toughening or making a particular entity more robust. Hence, while overthrowing implies the destruction of the existing system, its antonyms involve building it up, supporting it, or making it stronger.