First hand knowledge : মৌল জ্ঞন;
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Appropriate Prepositions
Abide with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Adept in (দক্ষ): He is adept in playing football.
Admit of(স্থান করা, সুযোগপ্রাপ্ত হওয়া): His offence admits of no explanation.
Caution against(সাবধান): Take all cautions against the danger.
Due to (কারণে): His absence is due to illness.
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Idioms
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.
Well off (স্বচ্ছল) - Jim and Della were not well off.