Biconcave : দুই দিকে বক্র; উভ-অবতল;
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Appropriate Prepositions
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Deal in, with, out (ব্যবসা করা, ব্যবহার করা, বন্টন করা): The man deals in rice. He does not know how to deal with a customer. The Chairman dealt out the relief materials to the flood affected people.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Entitled to (অধিকারী): He is entitled to a reward for honesty.
Senior to (বয়সে বড়): He is senior to me by two years.
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Idioms
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.