EDF Energy explains The Tackle . . . .
The current tackle law reads as follows:
A tackle occurs when a ball-carrier, in a standing position, is held by one or more opponents, and is brought to the ground or the ball touches the ground. That player is known as the tackled player. Any opponents of the tackled player who go to ground are known as tacklers.
When a player is tackled, he must place the ball, pass it, or let go of it immediately his body hits the ground so that play can continue. He is not allowed to hit the ground and keep tight hold of the ball.