KNOW-IT-ALL Meaning of KNOW-IT-ALL in English know-it-all BrE AmE ˈnəʊ ɪt ɔːl § -ət- AmE ˈnoʊ ət̬- -ɑːl ▷ know-it-all|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012