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Wrists crossed and uncrossed below the waist, cancelling the delivery.
The umpire crosses and uncrosses both wrists below the waist to call dead ball: nothing that happened counts. No runs are scored, no wicket falls, and play restarts from where it stood.
Signals that the ball is dead: the delivery or incident is annulled and neither runs nor a dismissal may result from it. The Laws define both when the ball becomes dead and the signal that announces it.
The ball also becomes dead automatically at many ordinary moments — when it settles with the wicketkeeper, when a batter is dismissed — and the signal is given only when the umpire needs to make it visible.
A standing figure crossing and uncrossing both wrists in front of the body below waist height, the arms forming a shallow cross.
Both are umpire signals defined by the Laws of Cricket, and dead ball can annul what the raised finger would otherwise confirm.