Obsolescence : বিলোপপ্রবণতা; পুরান হত্তয়া;
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Appropriate Prepositions
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Desire for (আকাঙ্ক্ষা করা): He has no desire for money.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Sentence to, for (দন্ডাদেশ দেওয়া): He was sentenced to death for murder.
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Idioms
All up with - (পুরোপুরি, হতাশ, সব আশা শেষ): If we can't, it's all up with the councillor.
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At the top of (শীর্ষে): The boy shouted at the top of his voice.
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.