Golden rule : শ্রেষ্ঠ নিয়ম; গুরুত্বপূর্ণ কোনো কর্মনীতি;
Related Words
golden oriole  golden rule  goldenoriole  See Words Also In
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Appropriate Prepositions
Competent for(যোগ্য): He is not competent for the post.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Fantasize about (কল্পনা করা): They fantasized about winning the lottery.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
Be all and end all (the ultimate out come- চরম পরিণতি—n) A loss of one million taka was the be all and end all of the projects.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
In no time (শীঘ্র): He will finish the work in no time.
Set something right (ঠিক করা)— He will set the machine right.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.