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
Abide by(মেনে চলা): We must abide by the rules of discipline.
Absorbed in(মগ্ন): I am absorbed in my study.
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Caution against(সাবধান): Take all cautions against the danger.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
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Idioms
As a whole (মোটের উপর, সম্পূর্ন এক মনে করে-adv.) Look at life as a whole and you will see that it is meaningful.
Burning question - (গুরুত্বপূর্ন বিষয়): Poverty problem is a burning question of our country.
Gift of the gab (বাকপটুতা): An advocate should have the gift of the gab.
In cold blood (ঠান্ডা মাথায়): They committed this murder in cold blood.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.