A friend in need is a friend indeed : অসময়ের বন্ধু প্রকৃত বন্ধুই; বিপদের বন্ধুই প্রকৃত বন্ধু;
Related Words
a friend in need is a friend indeed  afriendinneedisafriendindeed  See Words Also In
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Appropriate Prepositions
Based on(প্রতিষ্ঠিত, ভিত্তিক): His information is not based on the correct information.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Composed of(তৈরী): This medicine is composed of vitamins and minerals.
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Object to (আপত্তি করা): He objected to my proposal.
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Idioms
After all - (সব কথার পরেও): I rang and told her I couldn't come after all.
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Round the clock (সমস্ত দিন): He is working round the clock.
Run short (কমতি পড়া) —I ran short of money.