Can Anyone Explain What I'm Trying to Say?

[evilawyer]

Yes, even I am confounded. I'm trying to find the name of a particular knitting stitch so I can look it up to relearn how to do it, but I can't quite describe it. It involves knitting into the stitch below the one that's on your needle. I remember using it on every other stitch on one row, then knitting or purling (I can't remember which) on the next row, with the two rows repeated.

Does this have a name? I am remembering how to do it incorrectly?