Biconcave : দুই দিকে বক্র; উভ-অবতল;
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Appropriate Prepositions
Abhorrence of (ঘৃণা): Everyone should have abhorrence of a par.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Identical with (একই ধরণের): You are identical with your sister.
Look for (খোঁজা): I was looking for the lost phone.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At times (মাঝে মাঝে): He at times comes here.
Kith and kin (নিকট আত্মীয়): He has no relation with his kith and kin.
Set out (যাত্রা করা)— I will set out in time.
Short cut (সংক্ষিপ্ত পথ)— He comes by this shortcut.