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.
First lifeline, now twisted stitches? : r/knitting
Throw me a Lifeline Ingrid Babbidge Textile Heritage
How to put a lifeline in your knitting (Tutorial Video)
How to Knit With a Lifeline and Prevent Disasters - A Bee In The Bonnet
How To Count Knitting Stitches - Little Red Window
Adding a life line to your knitting
Play with a Fun Lace Stitch Pattern – Knitting
tutorial - inserting an afterthought life line - La Visch Designs
Knitting Terms Explained
How to Use A Lifeline
Adding a life line to your knitting
How to Use a Lifeline - Knitting Stitch Dictionary
Lifeline - What? Why? How? - 10 rows a day