Population explosion : আকস্মিক বা অতি দ্রুত জনসংখ্যা বৃদ্ধি; জন-বিস্ফোরণ;
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Appropriate to(যোগ্য): His answer is appropriate to the question.
Bad at (অদক্ষ): He is not bad at English.
Catch at(ধরা): A drowning man catches at a straw.
Remedy for (প্রতিকার): There is no remedy for his misbehavior.
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Idioms
Bad bargain (purchasing at a high price-বেশি দামে কেনা-n) You had a bad bargain of the watch I see.
In vogue (চালু): This custom is not in vogue at present.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Set out (যাত্রা করা)— I will set out in time.
Through thick and thin (through all difficulties, সমস্ত সমস্যার মধ্যে)-Ruma followed her husband through thick and thin.