Collective security : সম্মিলিত নিরাপত্তা;
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Appropriate Prepositions
Control over(নিয়ন্ত্রণ): He has no control over his sons.
Desire for (কামনা): He has no desire for fame.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Look at (তাকানো): Students look at the blackboard.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
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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.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
Now and then (মাঝে মাঝে): He comes here now and then.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.