What does sl1pw mean in knitting?

What does it mean to slip a stitch Purlwise?

To slip a stitch purlwise, you insert your needle into the next stitch as if to purl, and just slide it from your left needle to your right needle. … On the one that’s been slipped purlwise, the right-hand leg of the stitch is in the front of the needle and the left-hand leg is in the back.

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