Covertness : প্রচ্ছন্নতা;
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Appropriate Prepositions
Cause of(কারণ): Industry is the cause of your success.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Free from (মুক্ত): He is now free from danger.
Popte in, to (মার্জিত): We must be popte in our dealings. One should be popte to
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.