noun
fishing line
Refers to the main line used in fishing, as opposed to a leader or tippet.
道糸が切れて、大きな魚に逃げられた。
The fishing line broke and a big fish got away.
Compound of 道 (michi, 'path, way') and 糸 (ito, 'thread, line'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning 'fishing line'.