IPA: /ˈpætʃbɔːrd/
KK: /ˈpæʧbɔrd/
A board used to connect different circuits with cords, often found in telephone switchboards or early data processing equipment.
The technician used a patchboard to connect the various circuits in the old telephone system.
Patchboard → It is formed from "patch" (from Middle English *pacche*, meaning a piece or a small section) and "board" (from Old English *bord*, meaning a flat piece of wood or a surface). The word "patchboard" refers to a board that is made up of various patches or sections, often used in electrical or electronic contexts.
Think of a 'piece' ('patch') of material placed on a 'flat surface' ('board') — that's what a patchboard is, a surface made of different pieces.