To turn sour or cause to become sour; an archaic term for spoiling or souring something.
From Middle English dis- (intensive or reversal prefix) + sour (Old English sur, from Old Norse surr). The prefix suggests a process of becoming sour or making sour.
This word perfectly captures how Old English used prefixes to transform simple words into specific actions—'dis-' doesn't just mean 'not,' it can mean 'to become' or 'to cause to become,' which is why it generated hundreds of now-extinct words.
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