River basin : অববাহিকা; পর্যঙ্ক;
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refurbishing  river basin  river-basin  See Words Also In
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Appropriate Prepositions
Appointment with (সাক্ষাতের সময়): He has an appointment with the minister at 10:00 am.
Bad at (অদক্ষ): He is not bad at English.
Fatigued by (ক্লান্ত): He was fatigued by hard work.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
Shocked at (মানসিক আঘাতপ্রাপ্ত): Snigdha was terribly shocked at the death of Ratul.
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Idioms
In the wake of (ঠিক পরে): Police came in the wake of the accident.
To play on a fiddle (অনর্থক সময় নষ্ট করা - To waste time)-He played on a fiddle by nature.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.
Scapegoat (উদোর পিন্ডি বুধোর ঘাড়ে)—He was made scapegoat of the incident.
Wild goose chase (useless pursuit, পন্ডশ্রম) —Do not waste time in wild goose chase.