The term 'undoing' can refer to a variety of different concepts. The crossword solutions for this term include 'BLOW, ' 'DOOM, ' 'BLUNDER, ' 'FAILURE, ' 'DEFEAT, ' 'HUMILIATION, ' 'DISCOMFITURE, ' 'FRUSTRATION, ' 'END, ' 'BANE, ' 'RUIN, ' 'DEMISE, ' 'REVERSAL, ' and 'WATERLOO.' These words all refer to the idea of undoing something, whether it be a plan, an action, or a situation. For example, a 'BLOW' could refer to a setback that causes undoing, while 'DOOM' could refer to a feeling of inevitability that leads to undoing. A 'BLUNDER' is an error that can lead to undoing, and a 'FAILURE' is a lack of success that can cause undoing. 'DEFEAT' is a loss that can lead to undoing, and 'HUMILIATION' is a feeling of shame that can result in undoing. 'DISCOMFITURE' is a feeling of embarrassment that can lead to undoing, and 'FRUSTRATION' is a feeling of anger that can cause undoing. 'END' is a conclusion that can lead to undoing, and 'BANE' is a source of harm that can cause undoing. 'RUIN' is a state of destruction that can lead to undoing, and 'DEMISE' is a death or END that can cause undoing. 'REVERSAL' is a change in direction that can lead to undoing, and 'WATERLOO' is a decisive DEFEAT that can result in undoing.