Catastrophic : সর্বনাশা; আকস্মিক বিপত্তিমূলক;
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Appropriate Prepositions
Answer for(কোনো কারনে জবাবদিহি করা): He will have to answer for his misdeeds.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Aware of(অবগত): I am not aware of his dishonesty.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
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Idioms
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.