Co-operator : সহযোগী; সহায়ক;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Contribution to (অবদান): His invention made a major contribution to road safety.
Shout at (চিৎকার করে ডাকা): Do not shout at your parents.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Pass away (মারা যাওয়া)— He passed away last night.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.