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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

To treat yourself to something special or normally out of reach. In the Southern Cone darse el lujo can be genuinely positive, allowing yourself something good, or ironic, spending on what you really can't afford.