To nullify : বাতিল করা;
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Appropriate Prepositions
Aptitude for(স্বাভাবিক দক্ষতা, যোগ্যতা): He has no aptitude for public service.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Bar to(বাধা): Poverty is not a bar to happiness.
Compensate for(ক্ষতিপূরণ করা): I will compensate him for the loss.
Plead for (ওকালতি করা): He pleads for justice.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Gift of the gab (বাকপটুতা): An advocate should have the gift of the gab.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.