← BackshareGuessunderclothing/ˈʌndərˌkloʊðɪŋ/nounClothing worn next to the skin under outer clothes.He packed extra underclothing in his suitcase in case of cold weather.The store sells a wide variety of underclothing for men and women.She bought new underclothing for her trip to the mountains.Synonymsunderwearlingerie