Definition of running sore noun from the Oxford Advanced Learner's Dictionary

 

running sore

 noun
noun
BrE
 
; NAmE
 
 
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a small area on the body that is infected and has liquid (called pus) coming out of it a neglected animal covered in running sores (figurative) Mining and the condition of miners has been a running sore (= a serious continuous problem) in the country for many years.
See the Oxford Advanced American Dictionary entry: running sore