A cog in the machine : বিরাট ব্যবস্থা বা পরিকল্পনার এক নগণ্য অংশ;
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Apply for(কারো কাছে আবেদন করা): Sumi applied to the Principal for free studentship.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Popte in, to (মার্জিত): We must be popte in our dealings. One should be popte to
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Laughing stock (হাসির পাত্র)— He is a laughing stock to all.
To the brim (কানায় কানায়) - The river was full to the brim.
To go to the dogs (গোল্লায় যাওয়া)- He has gone to the dogs by keeping evil company.