Amelioration : উনতি, উন্নতি সম্পাদান;
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Deal with (কারো সাথে ব্যবহার বা আচরণ করা): Shahid can deal well with the customers.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
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Idioms
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Right and left (এলোপাথাড়ি - indiscriminately): He planted trees right and left.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.