Under the aegis of : সমর্থনে বা রক্ষণাবেক্ষণে বা নিশ্চিত আশ্রয়ে;
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Appropriate Prepositions
Devoted to (মনোযোগী): He is devoted to music.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Play with (খেলা করা/ মজা করা): I shall not play with him.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
Take pity on (দয়া করা): Take pity on the helpless people.
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Idioms
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Lame excuse (বাজে ওজর): The lame excuse will not do.
Make head or tail – (মাথামুন্ডু বুঝা) – I cannot make head or tail of what you say.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.