Sharpness : তীক্ষ্ণতা; প্রাখর্য;
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Appropriate Prepositions
Addicted to(খারাপ কিছুতে আসক্ত): She is addicted to collecting stamps.
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Consent to(মত দেওয়া): My father did not consent to the proposal of my sister’s marriage.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Rely on (নির্ভর করা): We should not rely on a lazy man.
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Idioms
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.