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
Argue over (কোন বিষয়ে তর্ক করা): The kids are arguing over which TV program to watch.
Attend to(মনোযোগ দেওয়া): Please attend to my advice.
Concern with (জড়িত থাকা): Asif is not concerned with this conspiracy.
Effect of (প্রভাব): The effect of corruption is very harmful for our society.
Fed up with (বিরক্ত): He is fed up with waiting for her.
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Idioms
At every step (প্রতি পদে পদে): There are dangers at every step in our life and yet we want to live.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Lump sum (এক কালীন) — He gave us lump sum money.
To meet trouble half-way (পুরোপুরি মোকাবেলার আগেই হাল ছেড়ে দেয়া): He met trouble half way after getting the instructions.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.