American Dictionary

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Definition sour in American English

sour verb

[intransitive/transitive] verb
/saʊr/
1

if a relationship or situation sours, or if something sours it, it stops being successful or satisfactory

Example

Relations between the two countries have soured.

Synonyms and related words
2

if something such as milk sours, or if something sours it, it gets an unpleasant taste or smell because it is no longer fresh

Synonyms and related words
Definition sour in American English