stick–in–the–mud

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stick–in–the–mud /ˈstɪkənðəˌmʌd/ noun
plural stick–in–the–muds
stick–in–the–mud
/ˈstɪkənðəˌmʌd/
noun
plural stick–in–the–muds
Learner's definition of STICK–IN–THE–MUD
[count] informal + disapproving
: someone who has old-fashioned ideas or who does not like trying new or exciting things