Orthogonal : লম্ব; সমকোণীয়;
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Appropriate Prepositions
Adapt for (উপযোগী করে নেওয়া): This book has been adapted for the children.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.