Lubricating : মসৃণ করা; পিচ্ছিল করা;
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Appropriate Prepositions
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
Play on (বাজানো): They play on the piano.
Run over (চাপা পড়া): The man was run over by a truck.
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Idioms
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Lose one’s heart (প্রেমে পড়া) — He lost his heart to the girl.
Short temper (রগচটা)— He is a man of short temper.
Without fail (অবশ্যই) - You must attend the meeting without fail.
With might and main (যথা শক্তি দিয়ে) —He tried with might and main to help me.