n [pl] (also fml 文雅语作 underclothing / -klEUTIN; -kloTIN/ [U])= underwear.
n also'under-.clothing [plural]
clothes that you wear next to your body under your other clothes
1. Kaz's father had been out back weeding the vegetables in his underclothes. 和子的父亲穿着内衣裤在屋外后院的菜地里除草。
2. After I had stacked my shirts and underclothes in two empty drawers, 我将衬衫、内衣放进两个空抽屉里，
3. I had stacked my shirts and underclothes in two empty drawers. 我把衬衫和内衣塞进两个抽屉。