good riddance (to bad rubbish)
said when you are pleased that a bad or unwanted thing or person, or something of poor quality, has gone

[TahlilGaran] Dictionary of Contemporary English ▲

good riddance
I'm happy that someone or something is gone.
Peter and his nasty dog have finally moved out. Good riddance!

Usage notes: the full form of the phrase is good riddance to bad rubbish, which is sometimes used

[TahlilGaran] English Idioms Dictionary ▲

Good riddance !
Good riddance (to bad rubbish)!
[informal]
an impolite way of saying that you are pleased someone has left.
Good riddance! I hope she never comes back.

[TahlilGaran] English Idioms Dictionary ▲

good riddance
used to express happiness when you lose/break something that you do not like or want, used when someone that you don't like leaves
I said good riddance when my old computer stopped working and I had to buy a new one.

[TahlilGaran] English Idioms Dictionary ▲

good riddance
n. A loss that you are glad about. Often used as an exclamation, and in the sentence "good riddance to bad rubbish". To show that you are glad that something or somebody has been taken or sent away.
The boys thought it was good riddance when the troublemaker was sent home.
When Mr. Roberts' old car was stolen he thought it was good riddance.
Betty thought it was good riddance when her little brother broke his toy drum.
"I'm going and won't come back," said John. "Good riddance to bad rubbish!" said Mary.

[TahlilGaran] English Idioms Dictionary ▲