International Institute of Cricket Umpiring & Scoring
Leg side, on side

Imagine a line running from the boundary at one end, passing
through middle stump of the nearest
wicket, straight down the
pitch, through middle stump of the
other wicket and going on to the opposite
boundary. When the striker is at the crease waiting for the ball to be delivered, the side of that imaginary line
on which he does not hold his bat is the on side. It follows that the on side will
change depending on
whether the batsman is right or left-handed.
The name may perhaps derive from the old days of horses and carriages - the on side being the side
on which a horse is mounted or a carriage entered from the pavement.
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