Unchallengeable : অপরিবর্তনীয়;
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Catch at(ধরা): A drowning man catches at a straw.
Curse for (অভিশাপ দেয়া): If he ever mistreats my parents, I will certainly curse him for it.
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Idioms
All in - (পরিশ্রান্ত): I was all in after the meeting.
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Null and void (বাতিল): The deed has been null and void now.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Turn over a new leaf (begin a new phase of life, নবজীবন শুরু করা) —After his failure he turned over a new leaf.