Wiktionary
be there for
vb. To be available to provide comfort and support for someone, especially in a period of difficulty.
Usage examples of "be there for".
I'd call my mother on the car phone and warn her I'd be there for dinner after all.
We were going to be there for two days and one night, and we planned every detail.
Or the killer's still in prison and'll be there for life, but he's warm, he's safe.
By that time the cargo will be there for him to load onto his carrier but wouldn't it be wise to have a few animals in the shipment so as to make it look good to the guards at control points?
Its weight was a rut twenty feet deep which would be there for keeps.
We'll have to be there for at least a few minutes to get Nita's pen out.