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
Cause of(কারণ): Industry is the cause of your success.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
Rejoice at/in (আনন্দ করা): Everybody rejoiced at/in his success.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
Run on (বিরতিহীন চলা): The bus is running on time.
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Idioms
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Give one’s right arm (বিপদের ঝুকি নেয়া): I will give my right arm if I could manage the tickets.
Out of order (বিকল): The elevator was out of order.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.