Starching (e.g., clothes) — the process of applying starch to garments to give them stiffness or to smooth wrinkles.
夏の浴衣は着る前に糊付けして襟元を整えることが多い。
Summer yukata are often starched before wearing to tidy the collar.
母は毎週ワイシャツの糊付けをしていた。
My mother used to starch dress shirts every week.
舞台衣装は糊付けで形を保つことが多い。
Stage costumes often keep their shape thanks to starching.
Pasting; gluing (e.g., paper, a letter) — applying adhesive to attach items such as posters or seals.
壁にポスターを糊付けして展示した。
I pasted the poster on the wall for display.
便箋を糊付けして封をした。
I sealed the letter by gluing the stationery.
細かい工作は糊付けが一番大事だ。
For detailed crafts, the gluing step is the most important.