The antonyms for the word "bunging up" are words that indicate the opposite meaning. The word "bunging up" means to block or obstruct something completely. The antonyms for bunging up are words like unblock, release, clear, open, free. To unblock means to remove the obstruction, and release means to let go or set free. Clear means to remove the blockage, and open means to allow passage. Free means to release from obstruction or captivity. Using these antonyms, we can create sentences that indicate the opposite of bunging up. For example, "He cleared the drain to prevent it from bunging up.