Lubrication : তৈলাক্তকরণ;
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Appropriate Prepositions
Burdened with (ভারাক্রান্ত): Rahim is burdened with a big family.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Due to (কারণে): His absence is due to illness.
Look for (খোঁজা): I was looking for the lost phone.
Make up of (গঠিত): Village is made up of many homes.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Pros and cons (খুঁটিনাটি): You should consider the pros and cons of the system.
Slow coach (অলস): You cannot expect much from a slow coach.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.