Rigor : কঠিন; কঠোর; উগ্র,খুব ঠান্ডা;
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rigger  rigor  rigour  See Words Also In
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Appropriate Prepositions
Aim at(আঘাত করার জন্য লক্ষ্য স্থির করা): The hunter aimed at the tiger.
Argue with, about(কথা কাটাকাটি করা): They always argue with me about tiny matter.
Enter into (আলোচনা করতে আরম্ভ করা): Let’s not enter into details at this stage.
Sanguine of (নিশ্চিত বা আশান্বিত): Be sanguine of your success.
Subsist on (বেঁচে থাকা): The poor subsist mainly on rice and pulses.
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Idioms
As ill-luck would have it (unfortunately- দুর্ভাগ্যবশত) A child was born to them but, as ill-luck would have it, it died when it was eight days old.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Lion’s share (বড় মাপের অংশ): He took the lion’s share of the profit.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.