underwear /ˈʌndɚˌweɚ/ noun Learner's definition of UNDERWEAR
[noncount]
: clothing that is worn next to your skin and under other clothing内衣 -
He answered the door in his underwear. [=while wearing only underwear]他穿着内衣去开门。
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You should pack a change of underwear. [=additional underwear that you can wear at another time]你应该带上一套换洗的内衣。
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long/thermal underwear [=winter underwear that covers your arms and legs]长袖/保暖内衣