brockage

noun

brock·​age ˈbrä-kij 

1

: an imperfectly minted coin

2

: an error made in striking a coin usually as the result of the coin getting stuck in the die

—often used before another noun

brockage coins

Word History

Etymology

English dialect brock rubbish + English -age

First Known Use

1718, in the meaning defined at sense 1