Concavo-convex : এক পার্শ্বে অবতল অন্য পার্শ্বে উত্তল;
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Aware of(অবগত): I am not aware of his dishonesty.
Concerned with(জড়িত): She was concerned with such things.
Convert to(দীক্ষিত): Tom is converted to another religion.
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
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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.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.