Meaning of the word "a bad penny always turns up" in English

What does "a bad penny always turns up" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a bad penny always turns up

US /ə bæd ˈpen.i ˈɔːl.weɪz tɜːrnz ʌp/
UK /ə bæd ˈpen.i ˈɔːl.weɪz tɜːnz ʌp/
"a bad penny always turns up" picture

Idiom

said to mean that a person you do not like or who is unreliable will always return or appear when they are not wanted

Example:
I thought he had moved abroad for good, but a bad penny always turns up.
Look who's here! I guess a bad penny always turns up.