How to double crochet decrease (dc2tog)
Decreasing a double crochet means that you will work 2 stitches together, so that they become 1 stitch.
You will see that I do not finish the first double crochet completely, before I start to work the second stitch. That is why you will have more loops on your hook during a decrease.
The abbreviation for a double crochet decrease: dc2tog
Below you will find the video tutorial and photo tutorial of the Double Crochet Decrease.
Video Tutorial | How to Double Crochet Decrease
Photo Tutorial | How to Double Crochet Decrease

1. We will work the stitches where the arrows are pointing at together. (decrease a stitch). Yarn over and insert your hook into the first stitch.

2. Yarn over and pull the yarn through the stitch.

3. Yarn over and pull the yarn through 2 loops. Now we are not going to finish this double crochet. But work into the next stitch.

4. Yarn over and insert your hook into the second stitch (now you have 4 loops on your hook). Yarn over again and pull the yarn through 2 loops.

5. Yarn over and pull the yarn through all remaining 3 stitches.

6. Now you have decreased a stitch.