IPA: //ˈteɪlˌbɔrd//
KK: /ˈteɪlˌbɔrd/
A flat board or platform at the back of a vehicle, often used for loading and unloading goods.
The workers placed the boxes on the tailboard of the truck for easy access.
Tailboard → It is formed from "tail" (from Old French *taile*, meaning the end or rear part) and "board" (from Old English *bord*, meaning a flat piece of wood). The word "tailboard" refers to a flat piece of wood at the rear end of a vehicle or container.
Think of the 'end' ('tail') of something being covered or supported by a 'flat piece of wood' ('board') — that's what a tailboard does.