Decreases — making two stitches into one
k2tog · ssk · cddA decrease is any manoeuvre that turns two or three stitches into one. What separates a good decrease from a bad one is not the count but the lean: the surviving stitch tilts to one side, and on a shaped edge or a lace panel that tilt is the design.
| Decrease | Written as | Leans | Loses | Where it belongs |
|---|---|---|---|---|
| Knit two together | k2tog | Right | 1 st | Right-hand edge of a piece worked upward; right side of a lace repeat |
| Slip slip knit | ssk | Left | 1 st | Left-hand edge; left side of a lace repeat. Mirror of k2tog |
| Purl two together | p2tog | Right (on RS) | 1 st | Wrong-side rows, when the decrease must show on the front |
| Slip 1, k2tog, psso | sk2p | Left | 2 sts | A steeper left-leaning decrease |
| Centred double decrease | cdd / s2kp | Neither — vertical | 2 sts | The spine of a chevron, the centre of a shawl, the top of a hat panel |
You could decrease everything with k2tog and the stitch count would be perfect. It would also all lean the same way, so one edge of your V-neck would look crisp and the other would look like a mistake. Matching the lean to the edge is the entire point.
How to Knit Decreases — SSK, K2tog, P2tog & More
All the standard decreases in one video, close enough to see the lean.