In English mean presses the elbow back

This trick is used when the opponent attacks from behind, by striking back with the left or the right elbow which pushes out the opponent to sway back then throw the swinging back elbow to the opponent's abdomen or rib. This trick is used when the opponents rush to enfold the back of body.

To protect
Hold up both hand guards, both elbows protect the chest and abdomen, both fists protect to the neck.

To counter
Throw the right or the left kick to the opponent's leg which puts off his balance.