Arch-enemy : শত্রুপ্রবর; বৈরীপ্রধান; ঘোর শত্রু;
Related Words
arcane  arch enemy  arch-enemy  archaean  archangel  archenemy  See Words Also In
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Appropriate Prepositions
Bound for(প্রস্তুত থাকা): Although we can see that it is bound for failure, it is fascinating to follow its journey.
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Dwell upon (আলোচনা করা): They dwell long upon the matter.
Repent of (অনুতাপ করা): I repented of my past.
Subject to (সাপেক্ষে): The man was appointed subject to the approval of the chairman.
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Idioms
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Bird’s eye view - (ভাসা ভাসা দৃশ্য, হালকাভাবে দর্শন): We took a bird’s eye view of the scenery.
Of course (অবশ্যই): Of course, you know what that meant.
Salt of the earth (গুরুত্বপূর্ণ ব্যক্তিবর্গ) —The salt of the earth is remembered always.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.