Collaborator : সাহায্যকারী; সহযোগী; একযোগে কর্মকারী; সহকর্মী;
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collaborator  collaborators  colporteur  See Words Also In
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Appropriate Prepositions
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Contribution to (অবদান): His invention made a major contribution to road safety.
Defend against (রক্ষা করা): We will defend our country against all enemies.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Gain Ground (সুবিধা পাওয়া): The wise are said to gain the ground in the long run.
Pin money (স্ত্রীর দেয়া হাত খরচ)— She saved her pin money.
Soft Soap (নিজ অভিপ্রায়ে/অভিসন্ধিতে তোষামোদ করা): He was expert in soft soap.