goodbye
nounUK /ˌɡʊdˈbaɪ/
US /ˌɡʊdˈbaɪ/
Something you say when you leave someone.
She waved goodbye to her friends at the bus stop.
OTHER MEANINGS
2. An act of leaving or saying farewell.
They said their goodbyes at the airport.
3. Used to express good wishes when parting.
Goodbye, and have a safe trip!
4. The end of something, such as a period or opportunity.
That loss was goodbye to their playoff hopes.