The phrase "pitch invasion" refers to when a large number of spectators enter a sports field or playing area during a game or event, usually without permission. Full definition
The full time whistle was greeted by looks of disbelief on the faces of the courageous heroes who were in turn greeted by the customary cup pitch invasion. (laligablog.com)
Large - scale pitch invasions by Premier League teams are largely a thing of the past but from time to time some fans end up on the pitch in moments of celebration. (famouscfc.com)
The Arsenal fan committed the ultimate pitch invasion fail as he charged onto the pitch following Shkodran Mustafi's header into the Chelsea net. (famouscfc.com)