Concubinage : অবিবাহিত অবস্থায় স্ত্রী-পুরুষের সহবাস;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Acceptable to(গ্রহণযোগ্য): Such behavior is just not acceptable in this school.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.