good·bye [or] good-bye
gUd baI
good·bye [or] good-bye
gUd baI
good--byes, good--bys, good-byes
interjection
used to signify or acknowledge a departure or the end of a telephone call.She left without even saying "goodbye."
noun
an expression of farewell, or the act of saying farewell.They said their goodbyes and left for the station.I hate goodbyes. Please tell them "Bon Voyage" for me.