Eating Humble Pie
Meaning
To be proven wrong, usually after boasting.
Example
With the fall of the Soviet Union, the communists are eating humble pie.
Origin
Humble pie is a derivation of umble pie and refers to the intestines of an animal especially when used for food. The original umbles were the innards of the deer: the liver, heart, entrails and other second-class bits. It was common practice in medieval times to serve a pie made of these parts of the animal to the servants and others that would be sitting at the lower tables in the lord’s hall.