goodbye

1 goodbye interjection
also goodby /gʊdˈbaɪ/
1 goodbye
interjection
also goodby /gʊdˈbaɪ/
Britannica Dictionary definition of GOODBYE
— used to express good wishes when someone is leaving
2 goodbye noun
also goodby /gʊdˈbaɪ/
plural goodbyes also goodbys
2 goodbye
noun
also goodby /gʊdˈbaɪ/
plural goodbyes also goodbys
Britannica Dictionary definition of GOODBYE
[count]
1 
: a remark or gesture made when someone is leaving
— sometimes used figuratively
2 
: a time or occasion when someone leaves

kiss (something) goodbye

— see 1kiss