Unauthentic : অপ্রমাণিক, বাজে;
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Appropriate Prepositions
Adept in (দক্ষ): He is adept in playing football.
Deaf to, of, in (না শোনা, বধির হওয়া): The boy is deaf to his father’s advice. This man is deaf of/in one ear.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
At the top of (শীর্ষে): The boy shouted at the top of his voice.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.