Make an example of others. It is a metaphor to warn others by punishing one person.

Apes and monkeys use the moon as a metaphor for ignorance. It is also a metaphor for wasting energy.

Year of the Monkey, Horse Moon and Monkey Horse: One of the 12 Zodiacs. Generally refers to the later years.

The monkey head and monkey brain are as active as monkeys, describing themselves as impetuous.

Washing monkey clothes is illusory and resembles a puppet. It is often used to satirize people who take refuge in evil forces and steal power. It's the same as "bathing the monkey to get the crown".

It is said that monkeys are afraid of blood, so people who train monkeys kill chickens and bleed to scare them. It is a metaphor to warn others by punishing one person.

Killing a chicken as an example is a metaphor for punishing one person to intimidate or warn others. Make an example of others.