Firstborn : প্রথম সন্তান; সর্বাগ্রজ;
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Appropriate Prepositions
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Compensate for(ক্ষতিপূরণ করা): I will compensate him for the loss.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.