zigzag rasp
A specialized woodworking or metalworking file with a zigzag cutting pattern. The term is technical and not commonly encountered in everyday conversation.
The craftsman filed the metal surface with a zigzag rasp.
Standard kanji spelling for this specialized tool.
Mixed kanji-kana spelling; may be easier to read for learners.
Compound of 雁木 (がんぎ, 'zigzag') and 鑢 (やすり, 'file, rasp'). The exact historical derivation is uncertain, but the name describes the tool's distinctive cutting pattern.