variant of 縗|缞[cui1]
Depicts a woven raincoat (衣) made from either grass or straw. Based on the original meaning "raincoat made from straw or grass", now written as 蓑. The meaning later shifted to "weaken" and "decline".
《說文》：“衰，艸雨衣。秦謂之萆。从衣象形。，古文衰。”
raincoat made from straw or grass