https://en.wikipedia.org/wiki/Yield_curve#/media/File:Yield_...
something like that is usually "what's expected".
When we see yield curve inversions, usually beginning with just a small 'kink' on some point in the curve, that means that the yield at a point further out is lower than a shorter dated security. When the yield curve inverts like this, it means that demand for shorter-dated bonds is higher than longer-dated bonds, and because the duration of longer-dated bonds is higher than shorter-dated bonds, when demand falls for longer-dated bonds, those investors will instead buy shorter-dated bonds. Can also mean that the market believes that a recession is coming, so there's a flight to safety out of equities and into shorter-dated treasuries.
That's the gist of it