Unanswering : নিরূত্তর;
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unanswering  unshrinking  See Words Also In
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Appropriate Prepositions
Contribution to (অবদান): His invention made a major contribution to road safety.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Penalty for, with (দণ্ড, জরিমানা): She has paid the penalty for the misuse of power with two years in prison.
Play at (খেলা): I do not play at cards.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
Cut a sorry figure (খারাপ ফল করা): He cuts a sorry figure in the examination.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.