to be furious, to be fuming
Nunca vi o Demétrio assim, soltando fogo pelas ventas!
I've never seen Demetrius like this, he's absolutely furious!
In the expression soltar fogo pelas ventas, the old word ventas means the nostrils. The image is that of an enraged animal — a bull snorting, or a fire-breathing dragon — whose fury seems to pour out through its nose as smoke and flame.
Source: Priberam.
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