In english mean bent fish

The boxer turns back the punch, bends the elbow and the inner wrist, twists the body to the left and steps forwards then throws the back punch down at the opponent's nose or the left jaws. This trick used for attack.

To protect
Hold up the left hand and wipe over, then sway back at the same time.

To counter
Throw obliquely the left-knee to the opponent's right Rib, if the boxer is a left handed fighter, reverse the descriptions from right to left.