measure word · a classifier used for a stack or pile of thin objects

他手里拿着一叠厚厚的信件。

verb · to fold something into a specific shape, such as clothes or paper

请把洗好的衣服叠好。

measure word · a classifier for repeated sections in a traditional musical composition or poem

这首曲子共分为三叠。

verb · to stack or layer things on top of each other

这些箱子叠放在角落里。