Infrequency : বিরলতা;
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Appetite for(ক্ষুধা): He has no appetite for food.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Indulge in (আসক্ত): You should not indulge in social media.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.