Sam Allardyce finally suffered the sinking feeling of relegation from the Premier League after Arsenal beat West Brom 3-1 at the Emirates Stadium.
Albion needed a victory in north London on Sunday to keep their slim hopes of avoiding the drop alive, but the Gunners sent them down with three games to play.
Emile Smith Rowe put Arsenal in front with his first Premier League goal and Nicolas Pepe added a stunning second six minutes later in a devastating first-half spell for the Baggies.
Matheus Pereira pulled one back midway through the second half, but Willian rubbed salt into Albion's wounds by scoring an elusive first Arsenal goal late on with a brilliant free-kick.
Victory for Arsenal, who are facing a tough task to qualify for European football next season, shattered Allardyce's proud record of having never been relegated from the top flight.