sour

US /saʊr/

UK /ˈsaʊə(r)/

B2
v.i.Intransitive Verb(Of relationship) to cease to be good or friendly
Penny's relationship with Tim began to sour after that argument
adj.AdjectiveBeing mean and not friendly
Tim was in a sour mood because he had no milk to drink
adj.AdjectiveSpoiled or made more acidic
Tim could not drink the sour milk
v.t.Transitive VerbTo spoil something or make something acidic
Penny decided to sour the milk to make pancakes with it
adj.AdjectiveTasting like an acid
Some fruits are very sweet, while others are very sour

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