turn sour

It started to turn sour in 1978, after she and Stevie had been together four years.

And if it does na turn out the way you thought it would, you're not going to cry or turn sour?

Nor need we turn sour if we fail to draw the prizes in life's lottery.

As soon as the cider begins to turn sour, or "hard," as people say, alcohol begins to form in it.

The blue milk above mentioned may be boiled like fresh milk, and does not readily turn sour.

On warm days you must open your frame and let in air, or the soil will turn sour and mossy.