Mental abstraction : চটকা;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Annoyed with(ব্যক্তির সাথে বিরক্ত হওয়া): I am annoyed with him.
Appear at/in(উপস্থিত হওয়া): I should appear at/in the exam hall in time.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Breathe one’s last (decease, die- শেষ নিঃশেষ ত্যাগ করা, মরে যাওয়া) The man breathed his last in his native village.
Easy and free (অমায়িক): The boy is easy and free, so he has many friends.
Round the clock (সমস্ত দিন): He is working round the clock.
Run short (কমতি পড়া) —I ran short of money.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.