Speed Down is a recurring trap item that decreases a player's speed by 1. The item is depicted as the skate but with an arrow pointing down. Although, Geta has similar effects to Speed Down, Speed Down has appeared in more Bomberman games.
Having more speed items can make a player hard to maneuver around hard blocks. If this is the case, decreasing speed may help to make it easier to maneuver. In general, it's best to avoid this item as much as possible.