lock stitch

a sewing-machine stitch in which two threads are locked together at small intervals.

Origin of lock stitch

First recorded in 1860–65

There can be no doubt that lock-stitch machines can be run as high as 3,000.

Scientific American Supplement, No. 598, June 18, 1887 |Various
There are two types of sewing machines in use—the chain-stitch and the lock-stitch.

Mechanical Devices in the Home |Edith Louise Allen
Elias Howe improved the sewing machine and patented his lock-stitch machine.

The Scrap Book, Volume 1, No. 5 |Various
In what way do lock-stitch machines differ from chain-stitch machines?

Mechanical Devices in the Home |Edith Louise Allen

A lock-stitch sewing machine (Figs. 132 and 133) consists of shafts and wheels which move the needle, feed plate and bobbin.

Mechanical Devices in the Home |Edith Louise Allen

lock stitch

a sewing-machine stitch in which the top thread interlocks with the bobbin thread