to pull a fast one, to con someone
Você pagou demais. Ele passou a perna em você.
You paid too much. He pulled a fast one on you.
Passar a perna on someone means deceiving them or gaining an advantage over them through clever, often dishonest means. The image is physical: in wrestling and games, "tripping" hooks the opponent’s leg to unbalance and bring them down.
Source: Dicionário Priberam.
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