LENGTHEN Meaning of LENGTHEN in English lengthen BrE AmE ˈleŋ k θ ə n § \ ˈlen t θ- ▷ lengthen|ed d▷ lengthen|ing ‿ɪŋ▷ lengthen|s z Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012