Cooperator : সহকর্মী; সহযোগী;
Related Words
co-operator  cooperator  coverture  See Words Also In
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Appropriate Prepositions
Adequate to(সমানুপাতিক): The salary, he gets, is not adequate to the volume of work he has to do.
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Dependent on (নির্ভরশীল): Sepm is dependent on his father.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
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Idioms
At random (indiscriminately—এলোপাথাড়ি-adv.) He talks at random like a mad man.
At the latest (খুব বেশি দেরী হলে) He will arrive here at 5 p. m. at the latest.
In a nutshell (সংক্ষেপে): Tell the whole story in a nutshell.
Rank and file (সাধারণ লোক): We should pay attention to the rank and file of the country.
Three score (ষাট): He is happy as his brother got three score.