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
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Ask about (কাউকে খোঁজ করা): Rahim asked about Karim.
Call for(চাওয়া): I will call for his explanation.
Fit for (যোগ্য): Sabina is not yet fit for marriage.
Loyal to (অনুগত): Every citizen must be loyal to the state.
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Idioms
Bring to light (disclose-প্রকাশ করা) The police brought the secret to light.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.