noun
used paper; wastepaper; paper for recycling
Refers to paper that has been used and is typically collected for recycling. Common in contexts like 古紙回収 (wastepaper collection).
毎週火曜日に古紙を出す。
I put out the used paper every Tuesday.
この箱は古紙回収用です。
This box is for wastepaper collection.
Compound of 古 (old) and 紙 (paper). The spelling 故紙 uses 故 (old/former) but is now rare.