Bolt from the blue : বিনা মেঘে বজ্রাঘাত; সম্পূর্ণ অপ্রত্যাশিত জিনিস;
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Appropriate Prepositions
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Regard for (সম্মান): Good boys have great regard for their teachers.
Stare at (চাওয়া বা তাকানো): He stares at me.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Hold water (ধোপে টেকা): This policy will not hold water in this situation.
Seventh heaven – (মহাখুশী) – I was in the seventh heaven when I heard the news of my BCS final result.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.