An overwhelming victory is an outcome in which one side has a decisive advantage over the other. This can be seen in the three crossword solutions: 'LANDSLIDE' (9 letters), 'ROUT' (4 letters), and 'cleansweep' (10 letters). A LANDSLIDE victory is a large margin of victory, while a ROUT is a complete defeat of one side by the other. A cleansweep is a complete victory in which one side wins every contest or race. All three terms refer to a situation in which one side has a clear and decisive advantage over the other.