Marginal cost : উপান্ত ব্যায়;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Hope for (আশা করা): Let us hope for the best.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Null and void (বাতিল): The deed has been null and void now.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.