名詞 sour:

1. a cocktail made of a liquor (especially whiskey or gin) mixed with lemon or lime juice and sugar
2. the taste experience when vinegar or lemon juice is taken into the mouth
   同義詞：sourness, tartness
3. the property of being acidic
   同義詞：sourness, acidity

動詞 sour:

1. go sour or spoil
   同義詞：turn, ferment, work
2. make sour or more sour
   同義詞：acidify, acidulate, acetify

形容詞 sour:

1. smelling of fermentation or staleness
   同義詞：rancid
2. having a sharp biting taste
3. one of the four basic taste sensations; like the taste of vinegar or lemons
4. in an unpalatable state
   同義詞：off, turned
5. inaccurate in pitch
   同義詞：false, off-key
6. showing a brooding ill humor
   同義詞：dark, dour, glowering, glum, moody, morose, saturnine, sullen

1. What a sour face she has!
   她的臉色多難看！
2. Most green fruits are sour.
   大多數(shù)未熟的水果都是酸的。
3. The hot weather has soured the milk.
   炎熱的天氣使牛奶變酸了。
4. The old man has been soured by poverty.
   那老人因貧困而變得乖戾了。