someone who pastes up bills or placards on walls or billboards
"The security guard stopped the poster from defacing the historic building's facade before he could paste any more flyers on it."
a horse kept at an inn or post house for use by mail carriers or for rent to travelers
"The weary traveler mounted the sturdy poster to continue his journey across the mountain pass."
A picture of a celebrity, an event etc., intended to be attached to a wall.
"The messenger mounted his poster to ride the night watch across the fields."
A posthorse.
In plain English: A poster is a large printed picture or advertisement that you stick on a wall to display information.
"The teacher pinned a colorful poster to the bulletin board for everyone to see."
Usage: A poster is a printed notice or advertisement displayed in public spaces to inform people about events or products. Do not use this word to mean a posthorse, which is an outdated term for a horse used to carry mail or messages.
To decorate with posters.
"The teenagers decided to cover every available wall of their dorm room with colorful music band posters."
In plain English: To poster something means to stick it up on a wall for everyone to see.
"The artist decided to poster the walls of the town square with his new paintings."
Usage: To poster a room means to cover its walls with posters, often creating a cluttered or heavily decorated look. This verb describes the physical act of attaching paper advertisements or artwork to surfaces rather than simply displaying them.
The word poster is a straightforward compound formed from the noun post and the suffix -er. It originally referred to someone or something that posts notices, which later evolved to describe the printed notice itself.