Collective security : সম্মিলিত নিরাপত্তা;
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Appropriate Prepositions
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Close to(নিকটে): Our College is close to the Post Office.
Quick at (চটপটে): A cashier must be quick at figures.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Three score (ষাট): He is happy as his brother got three score.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.