Rigor : কঠিন; কঠোর; উগ্র,খুব ঠান্ডা;
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rigger  rigor  rigour  See Words Also In
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Drop to (নিচে নামানো): Asif dropped his voice to a whisper.
Rebel against (বিদ্রোহ করা): The soldiers rebelled against the king.
Search for (সন্ধান করা): The police searched the halls of residence for arms.
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Idioms
Back and forth (to and fro-এদিক ওদিক – adv.) The mad man was walking back and forth in the doctor’s chamber.
Fall flat (ফলপ্রসূ না হওয়া): This business is going to fall flat.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Man of straw (অপদার্থ): We do not care for a man of straw like you.
Three score (ষাট): He is happy as his brother got three score.