Without hesitation : অম্লানবদনে;
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Appropriate Prepositions
Adhere to (লেগে থাকা, অটল থাকা): You should adhere to your principal.
Careless of(অসতর্ক): Do not be careless of your health.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Long for (আশা করা/কামনা করা): He longed for name and fame.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
Out of date (সেকেলে): This fashion is out of date.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.