What we describe as jum sao is the sinking elbow. This minimal move protects the under part of the upper body like belly and liver.
encyclopaedie
Wu sao will be described as protecting hand. It is the last line of defense in front of the body, before the attack reaches it.
Biu sao is a forwardly oriented movement, regularly used under the other arm as an emergency attack. It points towards the target one wants to...
The jut sao is executed with the inner part of the wrist and serves as a preparation for further attacks like a punch or a fung hao.