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
Abide by(মেনে চলা): We must abide by the rules of discipline.
Acquit of (অব্যাহতি দেয়া): The chief justice acquitted him of the charge of murder.
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Affection for(স্নেহ): She has a great affection for the child.
Look after (দেখাশুনা): He looks after me.
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Idioms
Beggar description - (অবর্ণনীয় হওয়া): The distress of the Muslims in Bosnia beggars description.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.