Sweater knit instr

Hello Knitters/Crocheters. This is my first time here and I hope we can be of help to each other. I have a question i’m not too sure about. i’m doing a lace pattn sweater that uses the abbr.:S2KP =
sl2 sts tog (knitwise), k1, psso. Does it mean that the 2sts slipped together get passed over the k1 st (in order to make a decrease)??
Need your advice and thanks a lot
BJ

Welcome!

Is it a double decrease? If it is then you would pass both slipped stitches over.

Yes, that’s just what it means and it is a double decrease.