Meaning of the word "have mercy on" in English

What does "have mercy on" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

have mercy on

US /hæv ˈmɜːrsi ɑːn/
UK /hæv ˈmɜːsi ɒn/

Idiom

to show compassion or forgiveness to someone

Example:
Please, have mercy on me and don't punish me.
The judge decided to have mercy on the young offender.