to mess up, to slip up
Desculpe, amigão... eu dei mancada interpretando mal a situação.
Sorry, man... I messed up by misreading the situation.
In dar mancada, mancada relates to Portuguese mancar ("to limp"). Priberam derives mancar from manco + -ar, and manco from Latin mancus ("physically impaired"). The image links a faltering step with an error, a connection found in many languages.
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