Definition of quitter noun from the Oxford Advanced Learner's Dictionary

 

quitter

 noun
noun
BrE BrE//ˈkwɪtə(r)//
 
; NAmE NAmE//ˈkwɪtər//
 
(often disapproving)
 
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a person who gives up easily and does not finish a task they have started I knew you weren’t a quitter.
See the Oxford Advanced American Dictionary entry: quitter