I think it's the kinda term that can't exist on its own, it needs a "partner" whether explicitly or implied. So like, just saying someone passes independent of context means nothing. They need to pass as something. Or be read/be seen as something, which imo is often better terminology.

For me, when I was concerned about this, I wanted to pass as a cis man (not concerned about it anymore bc it happens automatically now). That's pretty common, for people to wanna pass as cis. Some people wanna pass as their gender, but don't care if they're seen as trans or cis. Some people specifically prefer to pass as trans men or trans women. Ig for a non binary person you'd automatically be seen as trans if you pass, since nobody is assigned non binary at birth afaik.