In cricket, there are three upright sticks (called stumps) about knee height behind the batter. If the ball delivered by the bowler hits any of the three stumps, the batter is out. This is the case if the batter completely misses the ball or hits it and the ball still goes on to hit the stumps. In order to provide an unambiguous signal that the ball has hit the stumps, on top of the stumps are two small cylindrical objects known as ‘bails’ that straddle the two gaps between the three stumps. These bails rest on grooves carved into the top of the stumps and for the batter to be out, at least one of the bails has to be dislodged and fall to the ground. The grooves are supposed to be deep enough that the wind won’t dislodge them but shallow enough that even very slight contact by the ball with any of the three stumps will cause them to fall. On very windy days, umpires have the option of using heavier bails.
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