score an own goal

score an own goal and shoot the ball into one's own goal (to make a mistake which has the opposite effect from what was hoped) — забить мяч в свои ворота; навредить самому себе

Example: The bank scored an own goal by introducing unpopular charges. They lost a lot of customers.

Related vocabulary
[вырыть себе яму]
[себе во вред]
[не рой другому яму]
[загнать себя в угол]
[рубить сук]