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sour

2 verb
     
Related topics: Food
sour2 [intransitive and transitive]
1 if a relationship or someone's attitude sours, or if something sours it, it becomes unfriendly or unfavourable:
An unhappy childhood has soured her view of life.
2DF if milk sours, or if something sours it, it begins to have an unpleasant sharp taste

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