IPA: /ˈbʌtənər/
KK: /ˈbʌtənər/
A tool or device that is used to attach buttons to clothing or other items.
The tailor used a buttoner to quickly attach the buttons to the shirt.
Buttoner → The word is formed from "button" (from Old French *bouton*, meaning a small knob or fastener) and "-er" (meaning a person who). A buttoner is a person who uses or works with buttons.
Think of a 'button' as a small fastener and '-er' indicating a person. So, a buttoner is someone who works with buttons.