By rotation : পর্যায়ক্রমে বা চক্রাকারে;
Related Words
berating  by rotation  See Words Also In
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Concerned with(জড়িত): She was concerned with such things.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Learn by heart (মুখস্থ করা)— He learnt the poem by heart.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.