"Shock defeat" refers to a surprising and unexpected loss, where the outcome of a competition or event goes completely against what was expected. Full definition
Just accept last nights shocking defeat, without blaming the reserves, because only two of them started the game. (justarsenal.com)
Sunday's shock defeat at home to West Bromwich Albion handed the Premier League title to Manchester City, and the abject performances from some of his bigger players did not go unnoticed by the Man United boss. (punditarena.com)
Jeremy Corbyn says Labour faces «challenge on historic scale» after shock defeats in two mayoral contests (theguardian.com)