To become or make oneself humble; to do a penance or seek absolution for some wrong. A reference to Canossa Castle in Emilia Romagna, Italy, where Emperor Henry IV humbled himself before Pope Gregory VII in 1077 to have his excommunication lifted. After the company completely bungled the contract, the CEO himself went to Canossa in an attempt to pacify the clients. Looks like we'll have to go to Canossa and ask the IT department to fix our computers again.