Whenever he was distracted, he would lose his stitch and have to start over.
Когда он отвлекался, он терял свой стежок и приходилось начинать сначала.
Definitions
To lose one's place or rhythm while knitting, sewing, or performing a repetitive task, often resulting in a mistake or the need to start over. It can also be used figuratively to mean losing focus or getting distracted from what one was doing.