The phrase "bungs up" can be understood as a situation where something becomes blocked or obstructed. There are several antonyms for this term which include "clear", "unblock", "free", "open up" and "let loose". These antonyms signify the action of removing a blockage or barrier, thereby creating a pathway for liquids, air or other substances to flow freely. For instance, to clear a blocked drain or a clogged pipe is to remove the obstruction and allow the water to flow freely. Similarly, to unblock an artery or open up a congested air passage is to free the flow of the body's essential functions. Thus, antonyms for "bungs up" are terms that describe the action of elimination or removal of blockages, thereby restoring normalcy and functionality.