Snagged or pulled thread or yarn.

布料起皱或有抽线、抽纱征象；

youdao

Sew a running stitch (red thread in figure A) on the toe, as marked on the pattern (later it will be pulled to form gathers.)

根据模板上画好的痕迹在脚趾部分缝一段平针（如图A中红线所示），（以后这部分会被拉紧形成褶皱）

youdao

Button thread easily pulled out.

钉钮线容易拉脱。

youdao

They have pulled on every thread.

WHITEHOUSE: Press Briefing

It sat, dangling like a loose thread, demanding to be pulled.

BBC: The bloom of cancer