e.g. The grapes were too sour to enjoy. The milk had become sour from being left outside the fridge.
e.g. The curtains smelled sour and had moldy spots. Their journey went sour because they didn't plan carefully enough.
e.g. He was still sour from being defeated so thoroughly in the debate.
e.g. She ordered a sour at the bar.
e.g. You can sour the sauce with vinegar. The heat caused the yogurt to sour and become inedible.
e.g. I don't want to sour my relationship with him by making him think I don't trust him.
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