A white elephant : অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা;
Related Words
a white elephant  awhiteelephant  See Words Also In
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Appropriate Prepositions
Astonished at(বিস্ময়-বিহবল হওয়া): We were astonished at his unexpected success.
Authority over (কর্তৃত্ব, আধিপত্য): She has no authority over his growing daughters.
Devoid of (বিহীন/বর্জিত): He is devoid of common sense.
Object to (আপত্তি করা): He objected to my proposal.
Sorry for (দুঃখিত): He is sorry for his misdeeds.
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Idioms
As a rule (নিয়ম অনুসারে.) As a rule, she kept silent in the meeting.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Gala day (বিশেষ দিন): The Eid–Ul-Fitr is a gala day for Muslims.
To the backbone (হাড়ে হাড়ে): I know this boy to the backbone.
White color job – (উচ্চ শ্রেনীর চাকরি, যেখানে শারীরিক কাজ নেই বললেই চলে- a job without manual labour) - He wants a white color job.