Obsolescence : বিলোপপ্রবণতা; পুরান হত্তয়া;
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Appropriate Prepositions
Certain of(নিশ্চিত): Jamal is certain of his success.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Regard for (সম্মান): Good boys have great regard for their teachers.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Brown study (day dream-দিবাস্বপ্ন -n) The woman is absorbed in a brown study.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.
Well off (স্বচ্ছল) - Jim and Della were not well off.