Flog a dead horse : বৃথা চেষ্টা করা;
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Appropriate Prepositions
Abide with(সঙ্গে থাকা): If you would like to rest for a while, you can abide with me.
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Caution against(সাবধান): Take all cautions against the danger.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Three R's (প্রাথমিক শিক্ষা)— He has not yet learnt the three R's.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.
Ups and downs (উত্থান পতন)- There is ups and downs in a man's life.