Definition of scot-free adverb from the Oxford Advanced American Dictionary

 

scot-free

 adverb
adverb
NAmE//ˌskɑt ˈfri//
 
(informal)
 
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without receiving the punishment you deserve They got off scot-free because of lack of evidence. This idiom comes from the old English word “scot” meaning “tax.” People were scot-free if they didn't have to pay the tax.
See the Oxford Advanced Learner's Dictionary entry: scot-free