Loud speaker : শব্দ বিবর্ধক;
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Appropriate Prepositions
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Hinge on/upon (নির্ভর করা): The whole matter hinges upon this clue.
Refer to (সিদ্ধান্তের জন্য প্রেরণ করা): The matter was referred to the Chairman for a decision.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
In a fix (মুশকিলে পতিত হওয়া): The man is in a fix with his new hairstyle.
Man of letters (পন্ডিত ব্যক্তি): You are truly a man of letters.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Three score (ষাট): He is happy as his brother got three score.