http://dictionary.cambridge.org/dictionary/american-english/spoil_1?q=spoil Food spoils quickly in hot weather.
http://www.madisonmagazine.com/Madison-Magazine/June-2012/The-Business-of-Biking/
Poorly maintained country roads gave dairy farmers trouble, jostling the milk around and slowing delivery times so that milk went bad.
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Do "spoil" and "go bad" mean the same thing?