The word "tieup" means to connect or bind things together, either literally or figuratively. Its antonyms can be "loosen," "unfasten," "unleash," "release," or "detach." These words imply a state of disconnection, freedom, or independence. For instance, if you untie a knot, you unravel the connection between the two ends of a rope. If you unfasten your seatbelt, you release the bond between your body and the vehicle. On the other hand, "tieup" can also mean a situation where things are stuck, delayed, or obstructed. Its antonyms in this sense are "resolve," "fix," "aid," "ease," and "facilitate," which suggest a state of progress, completion, or assistance.