Mercilessly : ক্ষমাহীনভাবে;
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Appropriate Prepositions
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Averse to (বিমুখ): Rahim was averse of your various problems.
Break in (কথার মাঝে কথা বলা): As she was talking, he suddenly broke in, saying, ‘that’s a rat!’
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
From cradle to grave (দোলনা থেকে কবর পর্যন্ত): Everyone has to learn from cradle to grave.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.