Biconcave : দুই দিকে বক্র; উভ-অবতল;
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Appropriate Prepositions
Anxious about (কোনো কিছুর ব্যাপারে চিন্তিত বা উদ্বিগ্ন): Karim is anxious about his father’s death. Karim is anxious for getting a job.
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Deal with (কারো সাথে ব্যবহার বা আচরণ করা): Shahid can deal well with the customers.
Hope for (আশা করা): Let us hope for the best.
Taste for (রুচি; পছন্দ): He has a great taste for music.
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Idioms
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
In the long run (পরিণামে): You will have to suffer in the long run.
Set free (মুক্ত করা): The prisoners were set free.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.