হীরার ধার: Keenness as of the edge of a piece of diamond.
Related Words
হীরার ধার  হ্রাস করা  হ্রাসমান  হয়রান করা  See Words Also In
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Appropriate Prepositions
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Attain to (লাভ করা): He will not attain to his objective so soon.
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Plead for (ওকালতি করা): He pleads for justice.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
To the brim (কানায় কানায়) - The river was full to the brim.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.