Extinction angle : কুণ্ঠন কোণ; লোপ-কোণ;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Bask in(রোদ পোহানো): The boys and girls are basking in the sun right now.
Curse for (অভিশাপ দেয়া): If he ever mistreats my parents, I will certainly curse him for it.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
For good (চিরদিনের জন্য): He left the house for good.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.