Collaborator : সাহায্যকারী; সহযোগী; একযোগে কর্মকারী; সহকর্মী;
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collaborator  collaborators  colporteur  See Words Also In
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Appropriate Prepositions
Care of(যত্ন নেওয়া): You should take care of your health.
Charge with(অভিযুক্ত করা): He is charged with killing.
Cope with (এঁটে ওঠা; তাল মিলিয়ে চলা): They cannot cope with so much work.
Hanker after (আকাঙ্ক্ষা/লোভ করা): He hankers after riches.
Indifferent to (উদাসীন): Everybody is indifferent to my problem.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At death’s door (at the point of death- মৃত্যুর দ্বারে) The patient is now at death’s door.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Lame excuse (বাজে ওজর): The lame excuse will not do.