cops and robbers, n.All

Cops and robbers (n.) ends ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠in bloody noses and hurt feelings to the degree that children play that they are not playing.