a busman's holiday字面意思公共汽车司机的假日，引申为有名无实的假日；节假日照常上班。

【例句】
My father spent a busman's holiday working in his office.
爸爸的节假日有名无实，整个假期他都呆在办公室。

The fire crew's annual outing turned into a busman's holiday when their bus caught fire. Fortunately, no one was hurt in the blaze.
消防队员乘坐的巴士着了火，结果他们的年度出游变成了照常工作的假日，所幸无人在火中受伤。