Dead letter : নির্লক্ষ্য পত্র;
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Appropriate Prepositions
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Cause of(কারণ): Industry is the cause of your success.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Greed for (লোভ): He has an indomitable greed for wealth.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Liable to mislead (প্রতারণাপূর্ণ- deceptive): Appearances can often be liable to mislead.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.