sour

go sour or spoil

• “The milk has soured”
• “The wine worked”
• “The cream has turned--we have to throw it out”

make sour or more sour

smelling of fermentation or staleness

having a sharp biting taste

one of the four basic taste sensations; like the taste of vinegar or lemons

in an unpalatable state

• “sour milk”

inaccurate in pitch

• “a false (or sour) note”
• “her singing was off key”

showing a brooding ill humor

• “a dark scowl”
• “the proverbially dour New England Puritan”
• “a glum, hopeless shrug”
• “he sat in moody silence”
• “a morose and unsociable manner”
• “a saturnine, almost misanthropic young genius” Bruce Bliven
• “a sour temper”
• “a sullen crowd”

a cocktail made of a liquor (especially whiskey or gin) mixed with lemon or lime juice and sugar

the taste experience when vinegar or lemon juice is taken into the mouth

the property of being acidic