Tetrahedron : চতুস্তলক;
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Appropriate Prepositions
Abide by(মেনে চলা): We must abide by the rules of discipline.
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Convict of(দোষী সাব্যস্ত হওয়া): The accused person was convicted of the murder.
Look over (পরীক্ষা করা): He was looking over the answer scripts.
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Idioms
At liberty (free-মুক্ত-adj.) They are at liberty to go anywhere.
Bad book (disfavour-খারাপ নজর —n) The secretary has fallen in the bad book of the manager.
Bear hard upon (behave rudely-নির্দয়ভাবে ব্যবহার করা - V) Never bear hard upon your servants.
Call in question (সন্দেহ করা): No one can call his honesty in question.
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.