In English mean the invert elbow

The boxer uses the right elbow. Raises the elbow-joint up while pressing the fist down. Throws the right elbow to the opponent's bridge or the forehead from high to tow then steps forwards close to the opponent's body. This trick is used for attack.

To protect
Raises the diagonal left arm to counter.

To counter
Throws the right knee straight to the opponent's chest. If the boxer is a left handed fighter reverse the descriptions from right to left.