/ ˌgʊdˈbaɪ; NAmE / exclamation , noun
used when you are leaving sb or when sb else is leaving :
Goodbye! It was great to meet you.
She didn't even say goodbye to her mother.
We waved them goodbye .
We've already said our goodbyes.
Kiss me goodbye !
( figurative )
Take out our service contract and say goodbye to costly repair bills.
—compare bye
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IDIOMS
see kiss verb
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WORD ORIGIN
late 16th cent.: contraction of God be with you! , with good substituted on the pattern of phrases such as good morning .