Sounds quite unusual to me, but it's US English so I might just have no clue.

Found the context!

As a clueless Brit I would guess that it means "show up" as in "be there", as it is used on this other page.

Being there for someone means that you support them, are reliable, that kind of thing.

Das scheint mir eine Variante zu to stand up for so./sth. zu sein ...

für sich selbst einstehen

oder

zu sich stehen

eher, meine ich.

: to become involved with others and make an active contribution

But what we have to remind ourselves, and each other, is that our democracy only works for us if we show up.— America Ferrera

also : to provide help and support for someone

If you're in a position to defend and protect someone who is a victim of abuse, then do it… Show up for them. — Sa'iyda Shabazz

https://www.merriam-webster.com/dictionary/sh...

Dr. Melanie Greenberg, Ph.D., a Mill Valley, C.A.-based clinical psychologist who specializes in stress and mindfulness, and author of The Stress-Proof Brain, tells Thrive that showing up for yourself also means finding time for self-care amid our busy lives.

“We spend so much of our time either on ‘automatic pilot,’ doing routine, mundane things, overworking, or doing things for others. Showing up for yourself means taking a break from all of that in order to be mindful and present, to care for your own health, or to nurture your own creativity and energy,” she says.

https://thriveglobal.com/stories/how-you-can-...