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English definition of “stick-in-the-mud”

stick-in-the-mud

noun [C] uk   /ˈstɪk.ɪn.ðəˌmʌd/ informal disapproving us  
someone who is old-fashioned and too serious and avoids enjoyable activities: My dad's a real stick-in-the-mud.People who are boring and old-fashioned
(Definition of stick-in-the-mud from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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