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

1.
二重否定
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.
「何も知らない」という文は二重否定の例です。
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While common in some dialects, double negatives are generally considered grammatically incorrect in standard English.
一部の方言では一般的ですが、二重否定は標準英語では一般的に文法的に誤りであると見なされます。