Unfamiliar : অপরিচিত;
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unfamiliar  unfamiliarity  See Words Also In
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Creep up (বৃদ্ধি পাওয়া): The prices of are creeping up day by day.
Despair of (নিরাশ হওয়া): Do not despair of further improvement.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
In the long run (পরিণামে): You will have to suffer in the long run.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Up-to-date (আধুনিক) - Now-a-days ladies are very up to date.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.