A friend in need is a friend indeed : অসময়ের বন্ধু প্রকৃত বন্ধুই; বিপদের বন্ধুই প্রকৃত বন্ধু;
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a friend in need is a friend indeed  afriendinneedisafriendindeed  See Words Also In
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Appropriate Prepositions
Anxious for (কারোর ব্যাপারে চিন্তিত): Sabbir was anxious for her.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Heir of (উত্তরাধিকারী): He is the heir of his father.
Short of (অপর্যাপ্ত): I am running short of money.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
To the backbone (to the core, হাড়ে হাড়ে) —The boy is wicked to the backbone.
Worthy of (যোগ্য) - He is worthy of a good job.