noun
a drink made from lemon juice and water, sweetened and flavored
adjective
having a sharp, acidic taste; not sweet
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The lemonade tasted incredibly sour due to the high concentration of citric acid.
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I can't eat these sour candies, they're too tangy for me.
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That milk has gone sour, you shouldn't drink it.
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His attitude towards the project turned sour after he realized how much work it would require.