parting shot
nounUK /ˈpɑːtɪŋ ʃɒt/
US /ˈpɑːrtɪŋ ʃɑːt/
A mean or clever thing someone says right before they leave.
As she walked out the door, she took a parting shot at her brother.
OTHER MEANINGS
2. A final action or remark made when leaving a place or situation.
His parting shot was to turn off the lights and slam the door.
3. A last attack or criticism delivered as someone departs.
The coach's parting shot was that the team needed to practice more.
4. A final effort or attempt made just before ending something.
The singer's parting shot was a surprise song at the end of the concert.