Dead letter office : অবাপ্য পত্র করণ;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Bask in(রোদ পোহানো): The boys and girls are basking in the sun right now.
Convinced of (আশ্বস্ত): You are convinced of his product.
Indispensable to (অত্যাবশ্যকীয়): Your help is indispensable to him.
Lost in (মগ্ন): Simon is lost in meditation.
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Idioms
Fair and square (সৎ): The learned persons should be fair and square.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.