Biconcave : দুই দিকে বক্র; উভ-অবতল;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Consist of(গঠিত হওয়া): The committee consists of ten members.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.