Definitions:

1. go sour or spoil verb
   • The milk has soured
2. in an unpalatable state adjective
   • sour milk
3. inaccurate in pitch adjective
   • a false (or sour) note

Synonyms:

• acetify
• acidify
• acidity
• acidulate
• dark
• false
• off
• rancid
• salty
• sourness
• tartness
• turn

NearBy Words:

• sour-tasting
• sourball
• source
• sourdine
• sourdough
• soured
• souring
• sourish
• sourly
• sourness
• sourpuss
• soursop
• sourwood