Underwear is items of clothing that you wear next to your skin and under your other clothes. 内衣
noun [专属名词] 内衣，衬衣
She packed one change of underwear. 她打行李时带了一套换洗的内衣。
under (在…内) +wear (穿) →穿在里面的衣服→内衣
She packed one change of underwear. 她打行李时带了一套换洗的内衣。