| sour | (adjective) having a sharp biting taste | - |
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| (adjective) showing a brooding ill humor | Synonyms: dark, dour, glowering, glum, moody, morose, saturnine, sullen |
| (adjective) inaccurate in pitch | Synonyms: false, off-key |
| (adjective) smelling of fermentation or staleness | Synonyms: rancid |
| (adjective) in an unpalatable state | Synonyms: off, turned |
| (adjective) one of the four basic taste sensations; like the taste of vinegar or lemons | - |
| (noun) the property of being acidic | Synonyms: acidity, sourness |
| (noun) the taste experience when vinegar or lemon juice is taken into the mouth | Synonyms: sourness, tartness |
| (noun) a cocktail made of a liquor (especially whiskey or gin) mixed with lemon or lime juice and sugar | - |
| (verb) go sour or spoil | Synonyms: ferment, turn, work |
| (verb) make sour or more sour | Synonyms: acetify, acidify, acidulate |