Concavity : অবতলতা; খোল; গোলাকার ফাঁপা বস্তুর ভিতর;
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Appropriate Prepositions
Attacked with(আক্রান্ত): He is attacked with …
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
Far and wide (সর্বত্র): His fame spread far and wide.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Let loose (বল্গাহীনভাবে ছেড়ে দেয়া): He let his horse loose in the field.
Man of straw (অপদার্থ): We do not care for a man of straw like you.