a narrow passageway between or behind buildings:he took a short cut along an alleythere were a few muggings in the backstreets and alleys
a path lined with trees, bushes, or stones:alleys of standing stones
[with modifier] a long, narrow area in which games such as skittles and bowling are played:a skittle alley
Tennis, North American either of the two side strips between the singles sideline and the sidelines which count as part of the court in a doubles match.
Baseball the area between the outfielders in left-centre or right-centre field.