Cooperator : সহকর্মী; সহযোগী;
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co-operator  cooperator  coverture  See Words Also In
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Appropriate Prepositions
Conceal from(লুকানো) Do not conceal anything from me.
Cure of, for(রোগমুক্ত হওয়া): This man was cured of This drug is a cure for typhoid.
Desire for (কামনা): He has no desire for fame.
Die from (কোন কিছু জন্য মারা যাওয়া): The poor person died from hunger.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
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Idioms
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Crying need (জরুরী): Mass education is a crying need for India.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
White elephant (অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা): At last the department proved to be a white elephant.