A cog in the machine : বিরাট ব্যবস্থা বা পরিকল্পনার এক নগণ্য অংশ;
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Appropriate Prepositions
Abstain from(বিরত থাকা): I am trying to abstain from sweets for my new diet.
Adapt for (উপযোগী করে নেওয়া): This book has been adapted for the children.
Careful of (সতর্ক): He is very careful of his fault.
Run over (চাপা পড়া): The man was run over by a truck.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Out of date (সেকেলে): This fashion is out of date.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.
With a view to (উদ্দেশ্য)- He goes to college with a view to attending the class.