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English definition of “stickler”

stickler

noun [C]     /ˈstɪk.lər/ US  /-lɚ/ informal
a person who thinks that a particular type of behaviour is very important, and always follows it or tries to make other people follow it: He's a stickler for detail/accuracy/efficiency.Wanting everything to be right
(Definition of stickler noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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