Unfamiliar : অপরিচিত;
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unfamiliar  unfamiliarity  See Words Also In
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Appropriate Prepositions
Annoyed for(কোনো কারনে বিরক্ত হওয়া): The officer was annoyed with the clerk for being late.
Appoint to(নিযুক্ত করা/হওয়া): Kibria has been appointed to the post of Headmaster.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Rely on (নির্ভর করা): We should not rely on a lazy man.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At times (মাঝে মাঝে): He at times comes here.
Fair and square (সৎ): The learned persons should be fair and square.
Get rid of (মুক্তি পাওয়া): Try to get rid of the rogue.
Slow coach (অলস): You cannot expect much from a slow coach.