batwing
adjective uk/ˈbæt.wɪŋ/ us/ˈbæt.wɪŋ/
（衣袖）蝙蝠翼状的
used to refer to sleeves that fit closely at the wrist but hang loosely under the arm, or to clothes that have this type of sleeve
Batwing sleeves are back in fashion. 蝙蝠袖又重新流行起来了。
a batwing jumper/top 蝙蝠袖套头衫