ONCOST Meaning of ONCOST in English oncost BrE AmE ˈɒn kɒst ⇨ˈɒŋ-, -kɔːst AmE \ ˈɑːn kɔːst ˈɔːn-; -ˈkɑːst ▷ oncost|s s Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012