PASS SLIP STITCH OVER (P.S.S.O.)
(another method of decreasing).... In knitting instructions p.s.s.o. means to slip 1 st, K (or P) next st, then pass the slip st over the K (or P) st by inserting left needle into slip st on right needle and passing over the K st on right needle. Follow arrows in illustrations.
TO INCREASE
Knit or Purl 1 st (as directions call for), but do not slip stitch from left needle (Ill. No. 22 & 23). Knit or Purl into back of same st, then slip stitch off needle (Ill. No. 24).
Illustration shows a Knit increase.