1. (noun) sour
a cocktail made of a liquor (especially whiskey or gin) mixed with lemon or lime juice and sugar
2. (noun) sour, sourness, tartness
the taste experience when vinegar or lemon juice is taken into the mouth
3. (adj) sourness, sour, acidity
the property of being acidic
4. (adj) sour, rancid
smelling of fermentation or staleness
5. (adj) sour
having a sharp biting taste
6. (adj) sour
one of the four basic taste sensations; like the taste of vinegar or lemons
7. (adj) off, sour, turned
in an unpalatable state
"sour milk"
8. (adj) false, off-key, sour
inaccurate in pitch
"a false (or sour) note"; "her singing was off key"
9. (verb) dark, dour, glowering, glum, moody, morose, saturnine, sour, sullen
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"
10. (verb) sour, turn, ferment, work
go sour or spoil
"The milk has soured"; "The wine worked"; "The cream has turned--we have to throw it out"
11. (verb) sour, acidify, acidulate, acetify
make sour or more sour
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Definition of 'sour' 
