Say uncle!
Etymologists are unsure about origin of the term say uncle! One popular theory posits that it comes from a joke from the late 1800s in which a man is trying to get his parrot to say the word “uncle.” When the parrot refuses, the man throws the parrot into a pen with 10 fowls, expecting them to finish him off. He comes back to find his parrot killing off the last of the fowls, mimicking the man’s words: “Say uncle!” Etymologists believe the expression took on a life of its own from there, and was used as an idiom by bullies demanding that their tormented victims cry out for mercy, related to cry uncle.