waste thread; scrap yarn
Refers to thread or yarn that is leftover, tangled, or of poor quality, often discarded or used for cleaning.
Waste thread from factories is sometimes recycled.
裁縫の後、床にたくさんの屑糸が落ちていた。
After sewing, a lot of waste thread was on the floor.
Compound of 屑 (くず, 'waste, scrap') and 糸 (いと, 'thread').