For the sake of : জন্য; অনুরোধে;
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for the sake of  forthesakeof  See Words Also In
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Appropriate Prepositions
Agree to(ব্যক্তি ছাড়া অন্যকিছুর সাথে একমত হওয়া): We cannot agree to your proposal.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Die of (রোগে মরা): Many people died of cholera.
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Idioms
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
In vogue (চালু): This custom is not in vogue at present.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.