I occasionally hear this phrasal verb but never really understood what it means exactly. I fail to find a relevant definition anywhere. Oh yeah I'm familiar with the common usages of "line out" or "line something out" in construction, technology, etc. I use it all the time, but not in the same way as these examples
Shortbread live rosin to help line me out! (source)
...is probably one of the best people to help line me out on how freaked out I need to be about American democracy (source)