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
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Eager for, about (একাগ্র): The students for this school are eager for knowledge. The teacher is eager about the success of his students.
Look for (খোঁজা): I was looking for the lost phone.
Repent on (নির্ভরশীল): He is repent on his parents.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
Call in question (সন্দেহ করা): No one can call his honesty in question.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.
Show good manner (ভালো আচরণ প্রদর্শন ): You should show good manner in the company of young ladies.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.