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say goodbye▼(wish someone farewell upon their leaving)
verb
[UK: ˈseɪ ˌɡʊd.ˈbaɪ] [US: ˈseɪ ˌɡʊd.ˈbaɪ]

take one's leave▼(say goodbye)
verb
[UK: teɪk wʌnz liːv] [US: ˈteɪk wʌnz ˈliːv]