noun
edge-stitched seam; machined edge
Refers to a seam sewn close to the fabric edge, often as a finishing technique in sewing. The reading はしミシン is more common; たんミシン is a less frequent alternative.
端ミシンをかけると、布のほつれを防げます。
Sewing an edge-stitched seam can prevent the fabric from fraying.
このスカートの裾には端ミシンが施されている。
The hem of this skirt has been finished with an edge-stitched seam.
端 means 'edge' or 'end'; 端ミシン literally 'edge sewing machine stitching'.
Compound of 端 (はし, 'edge') and ミシン ('sewing machine'), referring to stitching done along the edge of fabric.