„Kau Sau is used to whisk away your opponents arms using a combination of co-ordinated Huen Sau and hip turn with Yiu Ma (waist energy)”
http://www.kwokwingchun.com/training-tips/techniques-glossary/kau-sau/
http://www.kwokwingchun.com/training-tips/techniques-glossary/huen-sau/
JW