Infrequency : বিরলতা;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Aware of(অবগত): I am not aware of his dishonesty.
Damage to (ক্ষতি): The flood caused much damage to crops last year.
Dull of (বধির; কানে শুনে না): He is dull of hearing.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
On the wane (হ্রাসমান): His fame is on the wane now.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.