stab in the back, n.Definitions

Stab in the back (n.) is ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the story told after a lost war: not the war's injustice but the press's disloyalty is to blame.