to vouch for someone, to trust completely
Meu irmão é uma pessoa muito boa e honesta, por ele coloco a mão no fogo.
My brother is a very good and honest person, I vouch for him completely.
One explanation associates the expression with the medieval trial by ordeal, the so-called "Judgment of God"." An accused person had to grasp or carry a red-hot iron; days later the hand was inspected, and a clean, unburnt hand was read as proof that God had shielded the innocent.
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