Altruism : পরার্থবাদ;
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Appropriate Prepositions
Aware of(অবগত): I am not aware of his dishonesty.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Devoted to (মনোযোগী): He is devoted to music.
Entrust with (কোনো কিছু দ্বারা কাউকে বিশ্বাস করে): He entrusted me with the thing.
Free from (মুক্ত): He is now free from danger.
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Idioms
Back and forth (এদিক ওদিক) The mad man was running back and forth in the hospital.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Flesh and blood (রক্তমাংসের শরীর): She's my own flesh and blood; I can't believe she treated me that way!
Out of sorts (সামান্য অসুস্থ): The baby is out of sorts after playing.
Red letter day (স্মরণীয় দিন): The 16th December is a red letter day for us.