Old English sopp- "bread soaked in some liquid," (in soppcuppe "cup into which sops are put"), from Proto-Germanic *suppo, related to Old English verb suppan (see sup (2)), probably reinforced by Old French soupe (see soup (n.)). Meaning "something given to appease" is from 1660s, a reference to the sop given by the Sibyl to Cerberus in the "Aeneid."