chase your (own) tail
US /tʃeɪs jʊər oʊn teɪl/
UK /tʃeɪs jʊər oʊn teɪl/

1.
白费力气, 徒劳无功
to spend a lot of time and effort doing something that achieves nothing
:
•
We've been chasing our tails all day trying to fix this bug, but we're no closer to a solution.
我们整天都在白费力气修复这个错误,但离解决方案毫无进展。
•
If you keep chasing your tail with minor issues, you'll never get the main project done.
如果你一直白费力气处理小问题,你永远也完不成主要项目。