OK, so you don't.
Defund the police is a proposed program to reform the police by taking responsibilities away from them. Mostly things they aren't equipped to do anyway, crisis intervention for example. Of course those new services need funding and as they do a job then that was formerly done by the police (badly), the funds will be taken from the police. So it's not simply defunding but a police reform were fund are transferred to other, new agencies.
Whoever thought up that moniker, didn't think it through. Now we have to explain it every time.
That is exactly what I implied.
Do you agree with the idea?