billboard
n. countable B1 Intermediate US //ˈbɪɫˌbɔɹd// UK //bˈɪlbɔːd// bill·board
n. a very large sign used for advertising, usually found outdoors next to busy roads. You see these when you want to catch the attention of people driving by.
n. a large outdoor board for displaying advertisements, typically located in high-traffic areas such as highways or city centres.
The new movie has a huge billboard in the city centre.
Drivers often get distracted by the bright digital billboards that line the main highway into the city.
The marketing campaign relied heavily on strategically placed billboards to ensure maximum brand visibility among daily commuters during the holiday season.
From bill + board.
Usage
Commonly used with the verbs 'post', 'display', or 'erect'.