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.
Sewing an edge-stitched seam can prevent the fabric from fraying.
The hem of this skirt has been finished with an edge-stitched seam.
Standard kanji-katakana spelling; 端 means 'edge' and ミシン is 'sewing machine'.
Compound of 端 (はし, 'edge') and ミシン ('sewing machine'), referring to stitching done along the edge of fabric.