Under pin : সত্যতা প্রতিপন্ন করা; জোরালো করা; সমর্থন করা; দেওয়াল ইত্যাদিতে ঠেকনো লাগানো;
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Appropriate Prepositions
Adorn with(সাজানো/সজ্জিত করা): Adorn the car with flowers.
Appointment with (সাক্ষাতের সময়): He has an appointment with the minister at 10:00 am.
Cruise to (জয় লাভ করা): The Bangladesh team cruised to their fifth successive win this afternoon.
Relevant to (প্রাসঙ্গিক): Your answer is not exactly relevant to my question.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Three score (ষাট): He is happy as his brother got three score.
Well-to-do (সঙ্গতিপূর্ণ) - He was not born in a well-to-do family.