Coefficient of friction : ঘর্ষণাঙ্ক;
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Appropriate Prepositions
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Die of (রোগে মরা): Many people died of cholera.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Innocent of (নির্দোষ): The maid servant was proved innocent of the alleged theft.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
In vogue (চালু): This custom is not in vogue at present.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.