ほつれ

noun

fray; frayed spot

Refers to a place where fabric or thread has come loose, such as a frayed edge or a run in a stocking.

• セーターの袖そでにほつれができた。

  There's a fray on the sleeve of my sweater.

• ストッキングのほつれを直なおす。

  I fix a run in my stockings.