Concavity : অবতলতা; খোল; গোলাকার ফাঁপা বস্তুর ভিতর;
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Appropriate Prepositions
Convert to(দীক্ষিত): Tom is converted to another religion.
Convince of(বিশ্বাস হওয়া): I am convinced of your efficiency.
Dedicate to (উৎসর্গ করা): His pfe is dedicated to the welfare of the country.
Desire for (কামনা): He has no desire for fame.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.