Biconvex : দুই দিকে স্ফীত;
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Appropriate Prepositions
Depend on (নির্ভর করা): Presently, the students depend on/upon guide books.
Hostile to (বিরোধী বা বিরূপ ভাবাপন্ন): Nobody is hostile to you.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
Welcome to (স্বাগত জানানো): You are welcome to our new office.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
At one’s elbow (near at hand — হাতের কাছে – adv.) His private secretary is always at his elbow.
Run high (বেড়ে যাওয়া) —The price of everything has run high.
Tooth and nail (তীব্রভাবে): He fought tooth and nail for the sake of country.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.