Through proper channel : যথাযথ প্রণালী-মাধ্যমে;
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Appropriate Prepositions
Breakdown of (বিস্তারিত): Here is statistical breakdown of data.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
In vogue (চালু): This custom is not in vogue at present.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.