Pumice stone : ঝামাপাথর;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Bad at (অদক্ষ): He is not bad at English.
Catch at(ধরা): A drowning man catches at a straw.
Indifferent to (উদাসীন): Everybody is indifferent to my problem.
Relation with (সম্পর্ক): I have no relation with the culprit.
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Idioms
In no time (শীঘ্র): He will finish the work in no time.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.
Take to one's heels (to run away, পালানো)- They took to their heels when they saw the policeman approaching.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.