score an own goal

score an own goal

1 (in football) score a goal by mistake against your own side. 2 do something that has the unintended effect of harming your own interests. informal
2 1991 Brian MacArthur Despatches from the Gulf War Television's mission to explain was taken to its outer limit and at times scored an own goal by developing a bias against understanding.
See also: goal, own, score