Awhiteelephant : অত্যন্ত ব্যয়সাপেক্ষ বিলাসিতা;
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a white elephant  awhiteelephant  See Words Also In
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Agree to(ব্যক্তি ছাড়া অন্যকিছুর সাথে একমত হওয়া): We cannot agree to your proposal.
Bar to(বাধা): Poverty is not a bar to happiness.
Free from (মুক্ত): He is now free from danger.
Take after (সদৃশ হওয়া, একই রকম হওয়া): The boy takes after his brother.
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Idioms
At last (in the end – অবশেষে) He tried hard, and at last, succeeded in achieving his goal.
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
Make hay while sun shines (ঝোপ বুঝে কোপ মারা) You should try to make hay while sun shines.
Slow coach (অলস): You cannot expect much from a slow coach.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.