Be all and end all : একমাত্র লক্ষ্য বা পরিণতি;
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Appropriate Prepositions
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Caution against(সাবধান): Take all cautions against the danger.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Congratulate on(অভিনন্দন জানানো): They congratulated me on my brilliant success.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Hush money (ঘুষ): He offered a hush money to disclose the file.
On the wane (হ্রাসমান): His fame is on the wane now.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.