Longman Dictionary of Contemporary English homepage

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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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