y/o

A yarn over, abbreviated y/o, is a knitting technique where you intentionally wrap yarn around the needle to create a new stitch. Unlike standard stitches formed by drawing yarn through existing loops, a yarn over leaves an eyelet or hole in the fabric. The stitch is created simply by moving the working yarn to the front of the needle (or leaving it in front, depending on your previous stitch), then working the next stitch normally. This traps the yarn on the needle as a complete stitch without requiring you to pull it through anything.

The mechanics vary slightly depending on context. If you yarn over between two knit stitches, you move the yarn forward to the front of the work, then knit the next stitch. If you yarn over after a purl stitch, the yarn is already at the front, so you simply move it to the back and forward again as you complete the next stitch. The direction and method adjust based on what stitch precedes and follows the yarn over, but the core principle remains: you add a stitch by looping the yarn without closing it through another loop.

Function and fabric properties

Yarn overs serve both structural and decorative purposes. A single yarn over creates a small hole; repeated yarn overs in patterns produce lace fabrics with systematic eyelet arrangements. Because each yarn over technically increases the stitch count, they are usually paired with decreases (such as knit two together) to maintain stitch count and prevent the fabric from widening uncontrollably. In lace knitting, the pattern of yarn overs and decreases creates the characteristic openwork. The holes also reduce weight and bulk, making yarn overs valuable in summer garments and shawls.

Yarn overs are sensitive to tension and yarn thickness. In delicate laceweight yarn (under 1000 yards per 50 grams), eyelets can be precise and prominent. In bulkier weights, the same technique may produce loose, undefined holes. The visibility of a yarn over hole also depends on subsequent rows: working a yarn over in stockinette stitch makes the eyelet stand out clearly, while incorporating it into textured stitches can blur its appearance. Tension inconsistency is the most common defect, causing some yarn overs to be noticeably larger or smaller than others in a pattern.

The abbreviation y/o appears in virtually all knitting patterns using lace or eyelet techniques. Knitters encounter it in everything from ornamental shawl borders to functional buttonholes. The terminology is consistent across English-language pattern sources, making it essential vocabulary for anyone reading or writing knitting instructions.