双重否定（I didn't say nothing 是双重否定句，包含 n't 和 nothing 两个否定词，此用法在标准英语中被视为不正确）a negative statement containing two negative words. ‘I didn't say nothing’ is a double negative because it contains two negative words, ‘n't’ and ‘nothing’. This use is not considered correct in standard English.
un.
1.
【语法】双重否定
n.
1.
aphrasecontainingtwonegatives
2.
asentenceinwhichtwonegativewordssuchas “not,” “don’t,” or “noone” areusedwhenonlyonewouldbecorrect, forexampleinthesentence “Idon’twantnodinner.”