Hand in glove : অত্যন্ত ঘনিষ্ঠ বা অন্তরঙ্গ;
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Appropriate Prepositions
Cause of(কারণ): Industry is the cause of your success.
Indulge in (আসক্ত): You should not indulge in social media.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Pity for (করুণা, সমব্যথা): I feel pity for this helpless old man.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Now and then (মাঝে মাঝে): He comes here now and then.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.