Flog a dead horse : বৃথা চেষ্টা করা;
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Concerned with(জড়িত): She was concerned with such things.
Fond of (প্রিয়/অনুরাগী): Children are fond of sweets.
Repent on (নির্ভরশীল): He is repent on his parents.
Similar to (সদৃশ): My T-shirt is similar to yours.
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Idioms
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Do yeoman’s service (বিশেষ উপকার করা): Freedom fighters have done yeoman’s service for country.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Tide over (বিপদ অতিক্রম করা-overcome ): The manager tided over the situation.
Weal and woe (সুখ-দুঃখ): Human life is full of weal and woe.