to turn a blind eye
Vi um homem escondendo uma cerveja dentro do casaco... tive que fazer vista grossa.
I saw a man hiding a beer inside his coat... I had to turn a blind eye.
The image can be read as willingly "making the vision thick" — pretending not to see clearly. It illustrates deliberately ignoring something; the cited English article does not establish an eighteenth-century Portuguese attestation.
Source: Phrases.org.uk — turn a blind eye. Priberam.
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