Tail fin : পুচ্ছ-পাখনা;
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Appropriate Prepositions
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Die by (দূর্ঘটনা বা অপঘাতে মরা/কোন কিছু দ্বারা মারা যাওয়া): He died by a road accident.
Fed up with (বিরক্ত): He is fed up with waiting for her.
Genius for (দক্ষতা): Nazrul had a genius for convincing girls.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
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Idioms
Bring to book (reproach-Start- ভর্ৎসনা করা) The father brought his son to book for his failure in the exam.
Pandora’s box (আপাতঃ দৃষ্টিতে ভালো মনে হলেও আসলে ভালো নয়)—His words proved to be Pandora’s box.
Steer clear of (avoid, দূরে থাকা)— You must steer clear of evil company.
To and fro (hither and thither, এদিক ওদিক)-The man is walking to and fro.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.