ramrod
noun [ C ] uk/ˈræm.rɒd/ us/ˈræm.rɑːd/
（旧式长枪的）推弹杆
a long, thin rod used for pushing explosives, bullets, etc. into old types of gun
Idiom
(as) stiff/straight as a ramrodidiom 笔直的；挺立的
very straight
The old lady's back is still as straight as a ramrod. 这位老太太的腰杆还是那样挺拔。