Dead letter office : অবাপ্য পত্র করণ;
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Appropriate Prepositions
Appropriate to(যোগ্য): His answer is appropriate to the question.
Ascend from (উপরে ওঠা): Rahim watched the mist ascending from the valley.
Careful of (সতর্ক): He is very careful of his fault.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Quarrel over (কোন বিষয়ে ঝগড়া করা): Do not quarrel over this trifling matter, let it be drop.
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Idioms
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
In no time (শীঘ্র): He will finish the work in no time.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Out of date (সেকেলে): This fashion is out of date.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.