Concavity : অবতলতা; খোল; গোলাকার ফাঁপা বস্তুর ভিতর;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Appointment with (সাক্ষাতের সময়): He has an appointment with the minister at 10:00 am.
Comply with(মেনে নেওয়া): The clerks must comply with the orders of their officer.
Curse for (অভিশাপ দেয়া): If he ever mistreats my parents, I will certainly curse him for it.
Devoted to (মনোযোগী): He is devoted to music.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.