Learn to Knit - Slip, Slip, Knit
slip, slip, knit (SSK) - left-slanting decrease
Slip the next two stitches from the left-hand needle onto the right-hand needle as if to knit. Place them back on the left-hand needle without twisting them. Knit these 2 stitches together through the back of the stitches. SSKs are used when a left-slanting decrease is desired, such as decreases on socks, raglan shaping and lace patterns.