Collective security : সম্মিলিত নিরাপত্তা;
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Appropriate Prepositions
Bar to(বাধা): Poverty is not a bar to happiness.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Consistent with(সামঞ্জস্যপূর্ণ): Your action is not consistent with your word.
Hatred for (ঘৃণা): I have no hatred for anyone.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At times (মাঝে মাঝে): He at times comes here.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.