sour (EN)

adjective, verb

adjective “sour”

1. having an acidic taste
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   To make foods taste more sour, you can add vinegar.
2. having gone bad or spoiled, especially used for milk
   The milk went sour, so we'll have to throw it away.
3. showing or feeling unfriendliness or dislike
   She spoke in a sour tone, making everyone feel unwelcome.
4. (of soil) too acidic for most plants to grow well in
   The farmer struggled to grow crops on the sour soil in the back field.

verb “sour”

1. to spoil (make something not enjoyable and friendly)
   The argument soured their friendship, and they stopped talking to each other.
2. (of milk) to go bad
   The milk soured after being left out of the fridge overnight.