Mental fatigue : মানস ক্লান্তি;
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Appropriate Prepositions
At lunch (দুপুরের খাবারে): They were talking so much at lunch that their food went cold.
Attacked with(আক্রান্ত): He is attacked with …
Burst out a laughter(হাসিতে ফেটে পড়া) He bursts out a laughter.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Repent of (অনুতাপ করা): I repented of my past.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
From hand to mouth (দিন আনে দিন খায়): The poor man live from hand to mouth.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.