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short of a length

a. (context idiomatic cricket English) of a ball that pitches short of a good length; a ball that bounces closer to the bowler than the area of the pitch regarded as the best for dismissing or restricting the scoring of the batsman.

Wikipedia
Short of a length

Short of a length (sometimes referred to as "back of a length" or "short of a good length") is a term used in the sport of cricket. It describes a delivery from the bowler that pitches short of the optimum length.

Length in cricket defines where the ball pitches on the wicket. A good length ball is one that pitches at a distance that makes it difficult for the batsman to ascertain whether to play the ball on the front foot or back foot. A bouncer is a ball that passes the batsman above chest height. A short of a length delivery is one that pitches in the area between the bouncer and good length balls.

This delivery can be dangerous for a batsman as it can bounce higher into the midriff. Also, the delivery can be extremely useful to a seam bowler. Good exponents include Stephen Harmison and Glenn McGrath.