Patent office : পেটেন্ট অফিস; কৃতিস্বত্ব কার্যালয়;
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Appropriate Prepositions
Appeal to, for(কোন ব্যক্তির কাছে কোন কিছুর জন্য আবেদন করা): The flood affected people appealed to the President for reef.
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Die of (রোগে মরা): Many people died of cholera.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
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Idioms
Base born (নীচ বংশজাত, খারাপ জাত—adj.) He is a base born person; I cannot go along well with him.
End in smoke (ব্যর্থ হওয়া): All his plans ended in smoke.
In the wake of (ঠিক পরে): Police came in the wake of the accident.
Round the clock (সমস্ত দিন): He is working round the clock.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.