noun
Refers to the final trimming of paper edges in bookbinding or printing to give a clean, even finish.
製本の最終工程で化粧断ちを行う。
The final step in bookbinding is trimming the edges.
この本は化粧断ちがきれいで、手触りがいい。
This book has a clean trim and feels nice to the touch.
断裁 is a broader term for cutting or trimming paper, while 化粧断ち specifically refers to the final decorative or finishing trim in bookbinding.
Compound of 化粧 (けしょう, 'makeup' or 'finishing touch') and 断ち (たち, 'cutting'), referring to the final trim that gives a polished appearance to paper edges.