Real Dictionary

busman's holiday
singular noun: If you have a holiday, but spend it doing something similar to your usual work, you can refer to it as a busman's holiday.

busman's holiday in American English
a holiday or vacation in which one does as recreation what one usually does as one's work
noun: a vacation or day off from work spent in an activity closely resembling one's work, as a bus driver taking a long drive

busman's holiday in British English
noun: a holiday spent doing the same sort of thing as one does at work