Collective security : সম্মিলিত নিরাপত্তা;
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Appropriate Prepositions
Concerned with(জড়িত): She was concerned with such things.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Play with (খেলা করা/ মজা করা): I shall not play with him.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.