Idiopathy : যে রোগের কারণ জানা যায় না;
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Appropriate Prepositions
Averse to (বিমুখ): Rahim was averse of your various problems.
Call in(ডাকিয়া আনা): They called in a doctor.
Descend on (আক্রমণ করা): Armed thieves descended on the helpless girl.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.
Ups and downs (উত্থান পতন): There are ups and downs in a man’s life.