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 with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Attest to(প্রত্যয়ন করা): I like to attest to your ability.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Entrust to (কাউকে কোনো কিছু বিশ্বাস করে দেওয়া): He entrusted the thing to me.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
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Idioms
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.