Biconcave : দুই দিকে বক্র; উভ-অবতল;
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Appropriate Prepositions
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Point out (চিহ্নিত করা): Point out the mistakes from the book.
Regard for (সম্মান): Good boys have great regard for their teachers.
Repent of (অনুতাপ করা): I repented of my past.
Similar to (সদৃশ): My T-shirt is similar to yours.
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Idioms
Acid test (অগ্নি পরীক্ষা): You must succeed in the acid test of the time you live in.45
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Give in (বশ্যতা স্বীকার করা): We will never give in to our enemies.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.