sour

1. (noun) The sensation of a sour taste. 2. (noun) A drink made with whiskey, lemon or lime juice and sugar. 3. (noun) (by extension) Any cocktail containing lemon or lime juice. 4. (noun) A sour or acid substance; whatever produces a painful effect. 5. (noun) The acidic solution used in souring fabric. 6. (verb) To make sour. 7. (verb) To become sour. 8. (verb) To spoil or mar; to make disenchanted. 9. (verb) To become disenchanted. 10. (verb) To make (soil) cold and unproductive. 11. (verb) To macerate (lime) and render it fit for plaster or mortar. 12. (verb) To process (fabric) after bleaching, using hydrochloric acid or sulphuric acid to wash out the lime. 13. (adjective) Having an acidic, sharp or tangy taste. 14. (adjective) Made rancid by fermentation, etc. 15. (adjective) Tasting or smelling rancid. 16. (adjective) (of a person's character) Peevish or bad-tempered. 17. (adjective) (of soil) Excessively acidic and thus infertile. 18. (adjective) (of petroleum) Containing excess sulfur. 19. (adjective) Unfortunate or unfavorable. 20. (adjective) Off-pitch, out of tune.