How to Use a Lifeline - Knitting Stitch Dictionary

A lifeline is a piece of waste yarn that allows you to rip back your stitches to the start at the beginning of a repeat when knitting lace.

Double Herringbone Mesh Stitch - Knitting Stitch Dictionary

How to put a lifeline in your knitting (Tutorial Video)

How to Place a Lifeline in your Knitting

Reversible Lace

Afterthought Lifeline Knitting and Crochet Forum

Placing a Lifeline — Andrea Rangel

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How to knit using a lifeline - The Blog - US/UK