Sigmoid : সিগমা;
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Appropriate Prepositions
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Devoted to (মনোযোগী): He is devoted to music.
Dressed in (সজ্জিত, পরিহিত): The girl was dressed in silk.
Faith in (বিশ্বাস): I have no faith in him.
Play on (বাজানো): They play on the piano.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
Head and ears (সম্পূর্ণরূপে): He is over head and ears in debt.
Irony of fate (ভাগ্যের পরিহাস): He could not succeed by irony of fate.
Pack up a quarrel (ঝগড়া মিটানো)— He packed up their quarrel.
Take to heart (মর্মাহত হওয়া)- He really took it to heart when I asked him to reconsider.