An intransitive verb meaning to become frayed or loose (as with threads, seams, or fabric).
古いセーターの袖がほつれてきた。
The sleeve of my old sweater has started to fray.
縫い目がほつれないように、端をしっかり縫ってください。
Please stitch the edge firmly so the seam doesn't come undone.
封筒ののりが弱くて角がほつれている。
The glue on the envelope is weak and the corner is coming loose.