manchar
/manˈt͡ʃaɾ/ · B1 · verb
to sully, to tarnish, to taint, to soil, to besmirch, to smear
🐆 From Latin maculare, to spot or stain, the root of immaculate
Una mancha is a stain or spot, so manchar means to put one there. It comes from Latin macula (spot). That same root gives English immaculate, which means without a stain. Manchar works literally (a shirt) and figuratively (a reputation).