go sour

Verb

figuratively

(food) To spoil, rot, become sour. / (figuratively) To become unpleasing, unpleasant, unsatisfying; unfulfilling to one's wishes.

Japanese Meaning

（食べ物が）腐る、傷む、酸っぱくなる / （比喩的に）うまくいかず、不満足な結果になる、望ましくない状態になる

If you leave the milk out overnight, it will go sour and be unusable.

牛乳を一晩外に置いておくと、腐って使えなくなります。

Sense（1）

(food) To spoil, rot, become sour.

Sense（2）

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

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

goes sour

（ present singular third-person ）

going sour

（ participle present ）

went sour

（ past ）

gone sour

（ participle past ）