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/Sounds like "mahn" (as in "mark") + "CHAHR" (as in "chat") + "seh" (as in "set")/

Meaning

To betray someone, rat them out, or act dishonestly toward someone who trusted you. In Argentina and the Southern Cone, mancharse (to stain yourself) is serious, it means you broke the code and damaged a friendship or alliance.

Examples

Se manchó con los compañeros cuando los delató al jefe.

He betrayed his colleagues when he snitched on them to the boss.

Don't sell us out, you don't do that to friends.

Regional synonyms

In Mexico, a softened and playful version of a homophobic slur, used more as a joke among close friends than as a real insult. It still carries the weight of the word it comes from, even when said in a casual or lighthearted tone, so context matters a lot.