no obj.
1- take off one's clothes脱衣服：
she undressed and climbed into bed
她脱衣上床
I went into the bathroom to get undressed.
我进浴室脱了衣服。
1.1
- with obj. take the clothes off (someone else)脱去（他人）衣服。
mass noun
1
- the state of being naked or only partially clothed全裸; 半裸：
women in various states of undress.
不同程度裸露的妇女。
2
- Military ordinary clothing or uniform, as opposed to that worn on ceremonial occasions【军】（别于礼服）军便服。比较 FULL DRESS.