noun
large sewing needle; wool needle; darning needle
A thick needle used for binding books, sewing thick fabrics, or darning. Often used in bookbinding and heavy-duty sewing.
本の修理には綴じ針が必要です。
You need a large sewing needle to repair books.
毛糸を通すために、とじ針を使った。
I used a wool needle to thread the yarn.
Compound of 綴じ (とじ, 'binding', continuative form of 綴じる) and 針 (はり, 'needle'). The reading はり becomes ばり due to rendaku.