Obtuse-angled : স্থূলকোণী;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Crave for(আকাঙ্ক্ষা করা): Everyone craves for care.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.