A cog in the machine : বিরাট ব্যবস্থা বা পরিকল্পনার এক নগণ্য অংশ;
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Appropriate Prepositions
Defend against (রক্ষা করা): We will defend our country against all enemies.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
Quarrel with (ঝগড়া করা): Some girls quarreled with one another.
Quick at (চটপটে): A cashier must be quick at figures.
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Idioms
Bare word (শুধু মুখের কথা, স্বাক্ষী প্রমানহীন কথা-n) He believed your bare word and now he has been played false with.
In lieu of (পরিবর্তে): Give me this pen in lieu of that.
To the brim (কানায় কানায়) - The river was full to the brim.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.
With a lavish hand (মুক্ত হস্তে)— Give away something with a lavish hand.