On cost : উপরি খরচা;
Related Words
on cost  on set  onomastic  onset  See Words Also In
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Appropriate Prepositions
Absorbed in(মগ্ন): I am absorbed in my study.
Breakdown of (বিস্তারিত): Here is statistical breakdown of data.
Concentrate on(কেন্দ্রীভূত করা): Try to concentrate your attention on your studies.
Fail in (ব্যর্থ হওয়া): He failed in getting internet connection in his room.
Informed of (অবহিত): I was not informed of your misfortune.
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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.
Crocodile tears (মায়াকান্না): He shed crocodile tears at our misery.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.