Ask HN: What does “past” mean on an HN post?

I submitted an item this morning, and I suspect it went into a bit bucket? Because unlike my usual submissions, it doesn't show a "discuss" link (to look for comments), just "past."

I guess it's not unique because when I look at submissions from the same domain I see "past" on some of them too... but only some? Clicking on the PAST takes me to the HN Search site, which makes sense for some older posts, but not a new one?

> 1 point by compsciphd on Aug 11, 2021 | past

Please remedy my ignorance.