This is the 12406th most frequent Spanish word.
mancha
Stain.
Here, 'mancha' refers to a physical stain or blot.
La mancha de vino en el mantel es difícil de quitar.
The wine stain on the tablecloth is hard to remove.
In this sentence, 'mancha' is used metaphorically to denote a flaw or imperfection.
Una pequeña mancha en su historial no le impide lograr sus metas.
A small blemish on his record does not prevent him from achieving his goals.
'Mancha' here describes a specific area or patch that contrasts with its surroundings.