英英释义：if a relationship or someone's attitude sours, or if something sours it, it becomes unfriendly or unfavorable.
“sour”可以作形容词也可以作动词。作形容词它最常见的意思是“酸的”“嗖的”，作动词意思是“恶化”“使......变糟”。
sour 既可以是及物动词也可以是不及物动词，不过在阅读中我们知道它更常作不及物动词。
compound 和 worsen
sentence
1. Many friendships sour over borrowed money.
2. After the Vietnam talk, the relationship between the US and North Korea soured again.
3. The territorial dispute between India and Pakistan soured bilateral relations.
4. As our special report in this week’s issue explains, superpower relations have soured.
5. The once-cordial relationship between Mr Trump and Deutsche has soured.
6. Business confidence had soured and the housing market, so often a leading indicator of economic trouble, had sagged.（这句中 confidence 和 sour 这组搭配出现频率要远低于 relationship/relations 和 sour 这组搭配，可以记下来）
practice
他和母亲的关系突然变得很僵。
The relationship between him and his mother soured suddenly.
参考翻译：His relationship with his mother soured all of a sudden.
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