Definitions

1. verb

to give off a sour smell, especially due to fermentation or spoilage.

“The milk had begun to sourish and had to be discarded.”

2. verb

to become or grow sour, typically due to fermentation or spoilage.

“The fruit had sourish undertones, which added to its unique flavor.”

3. noun

a sour smell, especially one caused by fermentation or spoilage.

“The kitchen was filled with a sourish odor that lingered for hours.”