1.A difficult ball came through, the batsman played on to his wicket and was out.
2.The umpire ruled that the batsman was out.
3.The first batsman had a short innings.
4.The umpire gave the batsman out (leg before wicket).
5.In any case, if it seems that the ball would not have struck the stumps, the batsman is not out.
6.He is a good batsman but a poor bowler.
7.To retire (a batsman in cricket) with a bowled ball that knocks the bails off the wicket.
8.The batsman usually knows and, traditionally, a batsman should "walk" - leave the ground - if he knows he is out.