busman’s holiday
noun/ˌbʌsmənz ˈhɒlədeɪ/, /ˌbʌsmənz ˈhɒlədi/
/ˌbʌsmənz ˈhɑːlədeɪ/
[singular]- a holiday that is spent doing the same thing that you do at work
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busman’s holiday
Definition of busman’s holiday noun from the Oxford Advanced Learner's Dictionary