A cog in the machine : বিরাট ব্যবস্থা বা পরিকল্পনার এক নগণ্য অংশ;
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Contribution to (অবদান): His invention made a major contribution to road safety.
Indebted to (ঋণী থাকা): We are indebted to the great leaders of the country for their service.
Inquire into (খতিয়ে দেখা): The police officer will inquire into the matter.
Rule over (শাসন করা): In the absence of the Parliament, the President rules over the country.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Set out (যাত্রা করা)— I will set out in time.