Biconcave : দুই দিকে বক্র; উভ-অবতল;
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Appropriate Prepositions
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Concerned with(জড়িত): She was concerned with such things.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Lost in (মগ্ন): Simon is lost in meditation.
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Idioms
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Far and wide (সর্বত্র): His fame spread far and wide.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.