暂无解释，欢迎补充。

宋本廣韻

廣韻目次：下平四宵小韻反切聲母韻母聲調平水韻等呼韻攝韻部国际音标罗马字遙餘昭以宵A平聲蕭開口三等效宵Ajĭɛujeu

方言集汇

◎ 粤语：zaau4

English

the scallops along the lower edge of a flag; the hanging decorations (ribbons， etc。) of a flag used in ancient times， a kind of flag