Betterment fee : উন্নয়ন দক্ষিণা;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Desist from (বিরত থাকা): She desisted from making this.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
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Idioms
At a discount (অনাদৃত) Female education is no longer at a discount now.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Fair and square (সৎ): The learned persons should be fair and square.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.