un·but·tonBrE/ˌʌnˈbʌtn/NAmE/ˌʌnˈbʌtn/verbpresent simple - I / you / we / theyunbuttonBrE/ˌʌnˈbʌtn/NAmE/ˌʌnˈbʌtn/present simple - he / she / itunbuttonsBrE/ˌʌnˈbʌtnz/NAmE/ˌʌnˈbʌtnz/past simpleunbuttonedBrE/ˌʌnˈbʌtnd/NAmE/ˌʌnˈbʌtnd/past participleunbuttonedBrE/ˌʌnˈbʌtnd/NAmE/ˌʌnˈbʌtnd/ -ing formunbuttoningBrE/ˌʌnˈbʌtnɪŋ/NAmE/ˌʌnˈbʌtnɪŋ/~sthtoundothebuttonsonapieceofclothing解开纽扣◆Heunbuttonedhisshirt. 他解开衬衣扣子。OPPbutton