Nigrescence : কৃষ্ণতা;
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Appropriate Prepositions
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Count for(গণ্য বা বিবেচিত হওয়া): There can be no lasting peace without true democracy in which the people play a part and count for something.
Delegate to (প্রতিনিধি): Nazrul welcomed the delegates to the new conference.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Cock and bull story (আষাঢ়ে গল্প): You must be ashamed of your cock and bull story.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.