Big wig : প্রধান লোক; ভারিক্কি লোক;
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big wig  bigwig  bigwigs  See Words Also In
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Appropriate Prepositions
Akin to(সমজাতীয়): These are akin to one another.
Assure of(আশ্বাস দেওয়া): I can assure you of the Principal’s honesty.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Congenial to(উপযোগী): The atmosphere is congenial to your health.
Indulge in (আসক্ত): You should not indulge in social media.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
Bad names (গালমন্দ—n) He called the man bad names.
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Slow coach (অলস): You cannot expect much from a slow coach.