At fault : কিংকর্তব্যবিমূঢ়;
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Appropriate Prepositions
Abhorrent to(ঘৃণ্য): Racism of any kind is abhorrent to me.
Abide in(বাস করা): I abide in Dhaka with my family.
Admit to(ভর্তি করা): The boy was admitted to class Nine.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
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Idioms
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Of course (অবশ্যই): Of course, you know what that meant.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.