[…] an issue which is dismissed by a person on the grounds that they consider somebody else to be responsible for it, or that it is “out of scope” in a particular context.

(“Somebody Else’s Problem” 2022)

References

“Somebody Else’s Problem.” 2022. Wikipedia, January. https://en.wikipedia.org/w/index.php?title=Somebody_else%27s_problem&oldid=1065923296.