Ultrasonic : অতিস্বনক; শ্রুতির অতীত; অতিধ্বনক; শ্রবণাতীত;
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Appropriate Prepositions
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Die of (রোগে মরা): Many people died of cholera.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Hope for (আশা করা): Let us hope for the best.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.
Moot point (অমীমাংসিত বিষয়): Dowry system is still a moot point in Bangladesh.