Unfamiliar : অপরিচিত;
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unfamiliar  unfamiliarity  See Words Also In
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Appropriate Prepositions
Easy of (সরল): The teacher is easy of approach.
Guess at (অনুমান করা): It is difficult to guess at the age of women.
Match for (প্রতিদ্বন্দ্বী): He is no match for me.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
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Idioms
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Slip of the tongue (বলায় সামান্য ভুল): This is a slip of the tongue; don’t pay much stress on it.
Safe and sound (নিরাপদে)— He reached home safe and sound.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
Swan-song (অন্তিম গীত, শেষ কর্ম): This writing is the swan song of Kazi Nazrul islam.