English version

straight/stiff as a ramrod

From Longman Dictionary of Contemporary Englishstraight/stiff as a ramrodstraight/stiff as a ramrodBENDsitting or standing with your back straight and your body stiff ramrod
Examples from the Corpus
straight/stiff as a ramrodSaid he was as stiff as a ramrod and would get nowhere, but he's pretty hard on people anyway.
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