(derogatory) A person, especially one formerly popular or influential, who continues in their field after their popularity or effectiveness has peaked and is now in decline.

past participle of there be

plural of has-been

Third-person singular simple present indicative form of have been around

Third-person singular simple present indicative form of have been around the block

past participle of be gathered to one's fathers

Repulsive, disturbing, or horrific sights can never be erased from memory once they have been seen.

Alternative form of what has been seen cannot be unseen

(simile, UK, informal, humorous) To look extremely disheveled.

present participle of look as if one has been dragged through a hedge backwards