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sour

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1sour/ˈsawɚ/adjective
sourersourest
1sour
/ˈsawɚ/
adjective
sourersourest
Learner's definition of SOUR  
[also more sour; most sour]
: having an acid taste that is like the taste of a lemon : tart
— see also sweet-and-sour
: having the unpleasant taste or smell of food that is no longer fresh
: unpleasant or unfriendly
informal  : bad or wrong

sour on

informal
: having a bad opinion of (something)

— sourly

adverb

— sourness

noun,[noncount]
2sour/ˈsawɚ/noun
pluralsours
2sour
/ˈsawɚ/
noun
pluralsours
Learner's definition of SOUR  
[count]
: an alcoholic drink that has a sour taste
3sour/ˈsawɚ/verb
sourssouredsouring
3sour
/ˈsawɚ/
verb
sourssouredsouring
Learner's definition of SOUR  
[no object]of food  : to lose freshness and get an unpleasant taste or smell : to become sour
[no object]  : to become unpleasant or unfriendly
   b  [+ object]  : to make (someone or something) unpleasant or unfriendly
[+ object]  : to make (something good) less pleasant or enjoyable

sour on

[phrasal verb]
sour on (something)US or sour (someone) on (something) 
: to stop liking or being interested in (something) or to cause (someone) to stop liking or being interested in (something)
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