S1B Knitting abbreviation not in glossary..

I am following this pattern Lady’s Jacket with Honeycomb Collar
and it has one instruction called S1B. I have searched the internet and can’t find the explanation. Can someone explain? Thanks

does it have beads in it?

Slip one back? It could be part of a mini-cable. Slip one stitch to a cable needle and hold to the back.
Maybe this pattern?
https://www.ravelry.com/patterns/library/ladys-jacket-with-honeycomb-collar