Co-operator : সহযোগী; সহায়ক;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Apologize to (ক্ষমা প্রার্থনা করা, দুঃখসহ ত্রুটি স্বীকার করা): The student apologized to the Principal for adopting unfair means in the examination.
Attacked with(আক্রান্ত): He is attacked with …
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Convinced of (আশ্বস্ত): You are convinced of his product.
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Idioms
Black sheep - (কুলাঙ্গার): Stay away from the Black sheep.
Maiden speech (প্রথম বক্তৃতা): His maiden speech fell flat on the audience.
Make both ends meet (আয় ব্যয় মেলানো): I cannot make both ends meet with my small income.
Pack of lies (ডাঁহা মিথ্যা)—He told pack of lies to prove himself innocent.
Turn a deaf ear to (pay no attention, প্রত্যাখান করা) —He turned a deaf ear to my proposal.