Ramrod (noun)

1. A rod used to push the charge into a firearm.
2. A rigidly straight, inflexible person or thing.
3. A straight stick or rod used to push cloth into place in a loom.

Origin:

Late 17th century: from earlier rammer-rod, from the verb ram (related to rammer) + rod.

Examples:

1. He used a ramrod to push the bullet down the barrel of the rifle.
2. She was a ramrod, always straight and unbending.
3. The ramrod was used to pack the cloth tightly into the loom.
4. He was a ramrod, always pushing himself and others to their limits.
5. The ramrod was a crucial tool for the weaver, used to keep the cloth tight and even.