- не иметь понятия
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[VP; subj: human]=====⇒ not to know (some fact) or not to have any knowledge (in some area):- X не имел понятия{{}}≈ X had no idea;- X didn't have <hadn't> the slightest <the foggiest> (idea <notion>);- X didn't have a clue;- X was clueless;|| X не имеет понятия об Y-e ≈ X doesn't know a thing about Y;- X is clueless when it comes to Y;|| [when used as a response only] понятия не имею! ≈ beats me!;- you got me!;- don't ask me!♦ Он [отец Алексей] сел за зеленый стол с умеренным изъявлением удовольствия и кончил тем, что обыграл Базарова на два рубля пятьдесят копеек ассигнациями: в доме Арины Власьевны и понятия не имели о счёте на серебро... (Тургенев 2). Не [Father Alexei] took his seat at the card-table with a moderated show of pleasure and ended by winning from Bazarov two and a half roubles in paper money: in Arina Vlassyevna's house they had no idea of how to reckon in silver... (2c).♦ Я стал её [девушку] искать. Я знал, что я ее увижу, а что дальше будет - понятия не имел (Искандер 6). I began to look for her [the girl]. Although I knew that I would eventually find her, I hadn't the slightest idea what would happen after that (6a).
Большой русско-английский фразеологический словарь. — М.: ACT-ПРЕСС КНИГА. С.И. Лубенская. 2004.