Milk that has gone bad is an example of something that would be described as sour.
The unsweetened juice of a lemon is an example of something that would be described as sour.
A person with a grumpy and rude personality who is angry all the time is an example of someone who would be described as having a sour personality.
When you really like a band but then they come out against something you believe in and you really don't respect them after that, this is an example of when you sour on the band.
When milk goes bad, this is an example of when it sours.
His game has gone sour.
A sour note.
A whiskey sour.
The milk will sour, soured on life.
Too much lemon juice will sour the recipe.
Origin of sour
- Middle English from Old English sūr
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle English sour, from Old English sÅ«r (“sour"), from Proto-Germanic *sÅ«raz (“sour"), from Proto-Indo-European *sÅ«r- (“sour (milk)"). Cognate with West Frisian soer, Dutch zuur (“sour"), Low German suur, German sauer (“sour"), Danish and Swedish sur (“sour"), French sur (“sour"), Icelandic sÃºr (“sour, bitter").