to wash oneself, to wash up
Esta ropa está sucia y tiene que lavarse.
These clothes are dirty and need to be washed.
Esto es para beber, bañarse y lavarse.
This is for drinking, bathing, and washing.
— भाग मिल्खा भाग (2013)
Uno debería lavarse las manos antes de comer.
One should wash their hands before eating.