What is a bucket in bowling?

In bowling, a bucket refers to a common spare leave that consists of four pins remaining in a square formation in the back row of the lane. The pins left standing are the 2, 4, 5 and 8 pins. This spare is also sometimes called the "double-pinion," "kitchen sink," or "Big Four" spare. To convert this spare, a bowler typically aims for the 2 and 5 pins, sending the ball diagonally across the lane. It can be a challenging spare to make, as it requires accuracy and the ball must have enough energy to knock over the back pins.