Semi-circular : অর্ধবৃত্তাকার;
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semi-circular  semicircular  See Words Also In
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Grateful to (কৃতজ্ঞ): We should be grateful to our teachers.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
Sheet anchor (শেষ আশ্রয়; প্রধান অবলম্বন; আসল খুঁটি)— This small piece of land is his sheet anchor.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.