double negative
US /ˌdʌbl ˈneɡətɪv/
UK /ˌdʌbl ˈneɡətɪv/

1.
dupla negativa
a grammatical construction in which two negative words are used in the same clause, often resulting in a positive meaning or an intensified negative meaning, depending on context and language
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The sentence "I don't know nothing" is an example of a double negative.
A frase "Eu não sei nada" é um exemplo de dupla negativa.
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While common in some dialects, double negatives are generally considered grammatically incorrect in standard English.
Embora comuns em alguns dialetos, as duplas negativas são geralmente consideradas gramaticalmente incorretas no inglês padrão.