DOUBLE CROCHET (dc) US term: single crochet
One of the key stitches in crochet, doubles are simple, compact stitches that form a dense fabric
1 To make a double crochet stitch, insert the hook under the top two loops of the next stitch on the previous row. 2 Wind the yarn around the hook (yrh).
3 Pull the yarn through the stitch, giving you two loops on your crochet hook.
4 Yarn round hook again, then pull the yarn through both loops. There’s your double crochet made and you’ll have one loop left on the hook, ready to do the next stitch.