Collective security : সম্মিলিত নিরাপত্তা;
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Appropriate Prepositions
Ask for (কোনো কিছু চাওয়া): Do not ask him for any help because he doesn’t like to help anyone.
Consent to(মত দেওয়া): The Prime Minister consented to the proposal.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Enter into (আলোচনা করতে আরম্ভ করা): Let’s not enter into details at this stage.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.