Collective security : সম্মিলিত নিরাপত্তা;
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Appropriate Prepositions
Adequate for(পর্যাপ্ত): The loan given by the bank is not adequate for the farming project.
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Certain of(নিশ্চিত): Jamal is certain of his success.
Concerned with(জড়িত): She was concerned with such things.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Crying need (জরুরী): Mass education is a crying need for India.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.