This is the 14276th most frequent Spanish word.
uña
"Uña" means "nail" (fingernail or toenail) in English.
The word 'uña' here refers to the fingernail that was broken.
Me he roto una uña mientras abría el paquete.
I broke a nail while opening the package.
The word 'uña' is used to describe the claw of the cat.
La uña del gato es muy afilada y puede causar cortes.
The cat's claw is very sharp and can cause cuts.
Here, 'uña' denotes the fingernail, which is used in playing the guitar as a playing tool.