boi de piranha

== Portuguese == === Etymology === Compound of boi +‎ de +‎ piranha. Literally, “piranha ox”. (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.) === Pronunciation === === Noun === boi de piranha m (plural bois de piranha) (figurative) sacrificial lamb (a person who is sacrificed (not literally) for the greater good of some cause)