IPA: /ˈbɪl.bɔːrd/
KK: /ˈbɪlˌbɔrd/
A large board used to display advertisements in public areas, often seen along roads or on buildings.
The new advertisement on the billboard caught everyone's attention as they drove by.
To promote something by displaying it prominently, similar to how advertisements are shown on large signs in public places.
The company decided to billboard their new product to attract more customers.
Past: billboarded
Past Participle: billboarded
Billboard is formed from "bill" (from Old English *bylle*, meaning a written notice or document) and "board" (from Old English *bord*, meaning a flat surface or plank). The word refers to a flat surface used for displaying written notices or advertisements.
Think of a 'written notice' ('bill') displayed on a 'flat surface' ('board') — that's what a billboard is.