Period of revolution : আবর্তনকাল;
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Appropriate Prepositions
Attacked with(আক্রান্ত): He is attacked with …
Call in(ডাকিয়া আনা): They called in a doctor.
Desire for (কামনা): He has no desire for fame.
Die for (আত্নত্যাগ করা): Our Chairman died for our country.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Lame excuse (বাজে ওজর): The lame excuse will not do.