/ˈsaʊə(r) ||; ˈsaυr/adj1 having a sharp taste like that of a lemon 酸的: This sauce is quite sour. 这种调味汁很酸。
2 (used especially about milk) tasting or smelling unpleasant because it is no longer fresh （尤指牛奶）变酸的: This cream has gone sour. 这奶油变酸了。
3 (used about people) angry and unpleasant （指人）坏脾气的，令人不快的:
a sour expression 难看的表情a sour-facedold woman 面带愠色的老太太
sour verb [T] (
formal 正式)
The disagreement over trade tariffs has soured relations between the two countries. 贸易关税问题上的分歧使两国关系变坏了。 ➔sourly adv ➔sourness noun [U] go/turn sour to stop being pleasant or friendly 变坏；变糟:
Their relationship turned sour after a few months. 几个月后，他们的关系变坏了。 sour grapes pretending to not want sth that in fact you secretly want, because you cannot have it 酸葡萄（因为得不到而说自己不想要）