n.about seven inches; the breadth of a fist with the thumb stuck out (used especially in archery to give the correct distance of the string from the bow)
N
a measure of the width of a hand and the extended thumb, used to calculate the approximate height of the string of a braced bow 拳高; 握紧拳头与竖起大拇指的高度，用来估算弓弦与弓背中心的距离
[archery]