arm slit（袖口开衩）是什么意思？音标发音+图解场景

袖口开衩 /ˈɑːm ˈslɪt/ n

English: arm slit · 袖口开衩

释义：Lateral slit through which the arm can be slipped to give it some freedom of movement.

这个词出现在以下图解场景（1）