Concavo-convex : এক পার্শ্বে অবতল অন্য পার্শ্বে উত্তল;
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Appropriate Prepositions
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Akin to(সমজাতীয়): These are akin to one another.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Contemporary of (সমসাময়িক): William Wordsworth was a contemporary for greater efficiency.
Make of (কোনো উপকরণ দ্বারা সরাসরি তৈরী বোঝাতে): This necklace is made of gold.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Cut to the quick (মর্মাহত হওয়া): I was cut to the quick by his birds.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.