This is a decrease that looks like an upside-down increase.
I thought you guys might like it. I don’t know what you’d use it for, but it has the virtue of being flat, and symmetrical, though it makes a hole.
It’s done by pulling a loop through two stitches and enlarging and using that loop to knit to the end of the row and purl back to the decreased stitches, then picking up the yarn again, and tightening the loop, to complete the second row.
If you’ve done any sliding-loop intarsia, this uses a similar technique.