Concavo-convex : এক পার্শ্বে অবতল অন্য পার্শ্বে উত্তল;
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Appropriate Prepositions
Convert to(দীক্ষিত): Tom is converted to another religion.
Enter into (আলোচনা করতে আরম্ভ করা): Let’s not enter into details at this stage.
Hit upon (পরিকল্পনা নেয়া): Rahim hit upon a new plan.
Indulge in (আসক্ত): You should not indulge in social media.
Stare at (চাওয়া বা তাকানো): He stares at me.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.