(as) straight as a ramrod
US /əz ˈstreɪt əz ə ˈræm.rɑːd/
UK /əz ˈstreɪt əz ə ˈræm.rɑːd/

1.
dritto come un fuso, molto dritto
very straight, especially with reference to a person's posture
:
•
He stood as straight as a ramrod, looking at the general.
Stava dritto come un fuso, guardando il generale.
•
Her back was as straight as a ramrod, even after hours of sitting.
La sua schiena era dritta come un fuso, anche dopo ore seduta.