adjective
sourer; -est
[also more ~; most ~]
having an acid taste that is like the taste of a lemon :tart
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)
noun
plural sours
[count] :an alcoholic drink that has a sour taste
verb
sours; soured; souring
[no obj] of food :to lose freshness and get an unpleasant taste or smell :to become sour
[no obj] :to become unpleasant or unfriendly
[+ obj] :to make (someone or something) unpleasant or unfriendly
[+ obj] :to make (something good) less pleasant or enjoyable
sour on
[phrasal verb]
sour on (something) or sour (someone) on (something) US :to stop liking or being interested in (something) or to cause (someone) to stop liking or being interested in (something)