How is a lock stitch formed?

What is a lock stitch?

: a sewing machine stitch formed by the looping together of two threads one on each side of the material being sewn.

What is stitch?

A stitch is a pain in the abdomen (usually on the side) that’s brought on by activity. It can range from sharp or stabbing to mild cramping, aching or pulling, and may involve pain in the shoulder tip too. Often it leaves you with no choice but to slow down or stop.

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