Quinquagenarian : পঞ্চাশ হইতে ঊনষাট বৎসর বয়স্ক;
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Appropriate Prepositions
Abound in(প্রাচুর্যপূর্ণ হওয়া): Fish abounds in the pond.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Desire for (কামনা): He has no desire for fame.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
At home (comfortable— আরাম) He feels at home in Dhaka now.
Fish in a troubled water (এলোমেলো অবস্থার সুযোগ নেয়া): He made a lot of money by fishing in a troubled water.
In no time (শীঘ্র): He will finish the work in no time.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.