Envelopes : খাম; লেফাফা; মোড়ক; আচ্ছাদন;
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envelopes  envelops  See Words Also In
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Free from (মুক্ত): He is now free from danger.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.