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.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Inquire for (দেখা করতে চাওয়া): He inquires for the manager.
Recover from (সুস্থ হওয়া; পূর্ব অবস্থায় ফিরে আসা): The patient has not yet recovered from his severe illness.
Taste of (স্বাদ; অভিজ্ঞতা): They have had some taste of problems.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At times (মাঝে মাঝে): He at times comes here.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.
Yellow dog (হীন ব্যক্তি) - A yellow dog is always hated by all.