Under the aegis of : সমর্থনে বা রক্ষণাবেক্ষণে বা নিশ্চিত আশ্রয়ে;
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Appropriate Prepositions
Adorn with(সাজানো/সজ্জিত করা): Adorn the car with flowers.
Careful of(যত্নশীল থাকা): Sadia is careful of her health.
Consolidate for (শক্তিশালী করা): The four new companies consolidated for greater efficiency.
Guard from/against (রক্ষা করা): My parents always guard me from/against bad people.
Rid of (মুক্তি দেওয়া): He will get rid of troubles soon.
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Idioms
Carry the day (জয়লাভ করা) The boys carried the day in the debate competition.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Red tape (official formalities, অফিসের কাজ)— You would not believe the red tape involved in getting the required permits.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.
Run a risk (ঝুকি নেয়া) — He ran a risk to save his life.