sour [ˈsaʊə(r)]

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adj. 酸的；酸腐的；刻薄的；vt./vi. 变酸；发坏；发酵

having a sharp , sometimes unpleasant , taste or smell , like a lemon , and not sweet

Those lemons are very sour. 那些柠檬很酸。
This milk has gone sour. 这牛奶已经变酸了。