The term "hanging off" implies a state of being suspended or left unsupported from something. Some possible antonyms for this expression include "securely attached," "firmly mounted," "steadfastly anchored," or "safely fixed." When an object or a structure is securely attached, it is not hanging off or in danger of falling. A securely attached item is not loose, floppy, or unstable. It is in a reliable position, whether it be mounted, fastened, or resting on a solid structure. Conversely, a hanging off object is in a precarious position and may require attention to prevent it from falling or collapsing. The antonyms to "hanging off" suggest stability, safety, and reliability.