The crossword solution for the term TOPPLES (OVER) is KEELS, which is a five-letter word. Keels are the structural elements of a ship that run along the bottom of the hull from the bow to the stern. They provide stability and strength to the vessel, and also act as a counterbalance to the weight of the superstructure and cargo. In addition, keels help to reduce drag and improve the ship's maneuverability.