Under lock and key : তালাবদ্ধ;
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Appropriate Prepositions
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Deal in (কোনো কিছুর ব্যবসা করা): They deal in green vegetables.
Hatred for (ঘৃণা): I have no hatred for anyone.
Indulge in (আসক্ত): You should not indulge in social media.
Repentance for (অনুতাপ): He has repentance for the past.
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Idioms
A bed of roses - (সুখকর অবস্থা): Life is not a bed of roses.
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
Well up (সুপন্ডিত)- Dr. Shahidullah was well-up in Bengali language.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.