When you knit to the end of a row, you turn your work around and knit back the other direction, right? What the pattern is saying is that you will knit PART WAY across the row and then turn it around and knit back the other direction instead of waiting till you get to the end of the row. (I'm using the word 'knit' loosely, it may be knitting or purling). This adds 'short rows' into the middle of the work, which is what creates the shape.
Does that make sense? If you just do it for a couple of rows, even if it feels weird you'll start to see what is going on and it will make more sense.
Mommy to two wonderful girls
"I don't have to conform to the vagaries of time and space, I'm a loony!" -Campbell Bain (David Tennant) 'Takin' Over the Asylum'
OTN: Cabled Sweater
, arm warmers, kids' clothes