Mainspring : মুখ্য উদ্দেশ্য; ঘড়ির প্রধান চালক-স্প্রিং;
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Appropriate Prepositions
Authority on(বিশেষজ্ঞ পন্ডিত): Kamal was an authority on English literature.
Aware of(অবগত): I am not aware of his dishonesty.
Beg for(অনুরোধ করা): Maria begged the Superintendent for a seat in the school hostel.
Competent for(যোগ্য): He is not competent for the post.
Indulge in (প্রশ্রয় দেওয়া): You should not indulge in idleness.
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Idioms
Fight shy (এড়িয়ে চলা): Why do you fight shy of your teacher?
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Take into account (বিবেচনা করা): Your activities should be taken into account.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.