Concavo-convex : এক পার্শ্বে অবতল অন্য পার্শ্বে উত্তল;
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Agree with(ব্যক্তির সাথে একমত হওয়া): I agree with you.
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Covetous of(লোভী হওয়া): He is covetous of wealth.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
On the whole (মোটের ওপর): On the whole, his conduct is good.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.