UNDERACT Meaning of UNDERACT in English underact BrE AmE ˌʌnd ə r ˈækt AmE \ - ə r-▷ underact|ed ɪd əd ▷ underact|ing ɪŋ▷ underact|s s Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012