turn sour
- spoilDamage or overindulge
- curdleCongeal into lumps
- fermentMicrobial chemical breakdown
- bitterSharp, unpleasant taste
- rancidDecomposed fat's quality
rot · decay · vinegar · milk · sour · acidic · tart · relationship · mood · resentment · fester · turn · bad · off · pucker · lemon · yogurt · disappointment
relationship/situation deterioration
turn sourimprove
Raise in quality
flourish · turn around · blossom · work out · thrive
emotional/attitudinal shift
turn sourbrighten up
Make lighter or happier
cheer up · lighten up · warm up · sweeten · brighten