(cricket) Describing the way of getting out in which the ball would have hit the batsman's wicket, but hits the batsman's legs or more rarely another part of the batsman's body without first hitting the bat or a hand holding the bat.

(cricket) An instance of a batsman being out due to the leg before wicket law.

(cricket) A fielding position on the leg side, square of the batsman's wicket; a fielder in that position.

(cricket) The umpire who stands at or near square leg to rule on decisions at the batsman's end of the wicket. In some circumstances, the umpire may stand at the equivalent position on the opposite side of the batsman (between gully and point), but is still referred to as the square leg umpire in these circumstances.

(cricket) A fielding position on the leg side, square of the batsman's wicket, between leg gully and midwicket; a fielder in that position.

(quantum mechanics) The discontinuous change of the state of an electron in an atom or molecule from one energy level to another. / (figuratively) An abrupt, extreme change.

(games) A game, often played by children, in which a player leaps like a frog over the back of another person who has stooped over. One variation of the game involves a number of people lining up in a row and bending over. The last person in the line then vaults forward over each of the others until he or she reaches the front of the line, whereupon he also bends over. The process is then repeated.

(transitive) To jump over some obstacle, as in the game of leapfrog. / (transitive) To overtake. / (intransitive) To progress.

(cricket) A fielding position on the leg side, behind square and near the boundary. / (cricket) The fielder in that position.

(cricket) The area on a pitch considered to be the best place to pitch the ball in order to either get the batsman out, or restrict him from scoring; the length at which the ball bounces just too far away for it to be comfortably played either on the front foot or the back foot.