Biconcave : দুই দিকে বক্র; উভ-অবতল;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Attacked with(আক্রান্ত): He is attacked with …
Infested with (অতিষ্ঠ): The room is infested with rats.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.