IPA: /ˈflɔːrˌbɔːrd/
KK: /ˈflɔːrˌbɔrd/
A long, flat piece of wood that is used to make the surface of a floor.
The old house had beautiful wooden floorboards that creaked when you walked on them.
Floorboard → It is formed from "floor" (from Old English *flōr*, meaning the lower surface of a room) and "board" (from Old English *bord*, meaning a flat piece of wood). The word "floorboard" refers to a flat piece of wood that makes up the surface of a floor.
Think of the 'lower surface' ('floor') covered with 'flat pieces of wood' ('board') — that's what a floorboard is.