Keep mum : চুপ করে থাকা; নীরব থাকা; মৌন থাকা;
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keep in  keep mum  keep on  See Words Also In
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Appropriate Prepositions
Abide with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Call on(কারও সাথে দেখা করা): I called on him in his office.
Entitled to (অধিকারী): He is entitled to a reward for honesty.
Run after (পশ্চাদানুসরণ করা): Do not run after money.
Yield to (নতি স্বীকার করা): I shall not yield to his temptation.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.