go sour

go sour (third-person singular simple present goes sour, present participle going sour, simple past went sour, past participle gone sour)

1. (food) To spoil, rot, become sour.

   Synonym: go bad

2. (figuratively) To become unpleasing, unpleasant, unsatisfying, unfulfilling to one's wishes.

   Synonym: turn sour

   The flight went sour after I spilled coffee all over myself.

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