Over-estimation : অতিমান;
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over-estimation  overestimation  See Words Also In
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Appropriate Prepositions
Answerable to (কারো কাছে জবাবদিহিতা করা): He is not answerable to anybody for his mistake.
Arrange for(ব্যবস্থা করা): We have arranged everything for our study tour.
Concerned for (উদ্বিগ্ন): The parents are concerned for their growing children.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Silver living (hope- আশা বা ভালো দিক): Every cloud has a silver lining.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.