Perforators : ছিদ্রকারী; বিদ্ধ করার যন্ত্র; ছিদ্র করার যন্ত্র; আগর;
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perforators  proprietors  See Words Also In
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Appropriate Prepositions
Conform to (নিয়মনীতি অনুসরণ করা): The employees have to conform to a strict dress code.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Smile on/upon (অনুগ্রহ করা): Fortune smiles on/upon the brave.
Work for (কারো জন্য কাজ করা): She works for a construction company.
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Idioms
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Round the clock (সমস্ত দিন): He is working round the clock.
Run into debt (ঋণগ্রস্ত হওয়া)— He ran into debt.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.