good bye

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Definitions from WordNet

Noun good bye has 1 sense

adieu, adios, arrivederci, auf wiedersehen, au revoir, bye, bye-bye, cheerio, good-by, goodby, good-bye, goodbye, good day, sayonara, so long - a farewell remark; "they said their good-byes"
--₁ is a kind of farewell, word of farewell

Definitions from the Web

Good Bye

Definition:

(noun) An expression used to bid farewell; a parting salutation.

(interjection) Used to express good wishes or express farewell to someone.

Sense 1:

(noun) A formal or polite way of saying farewell or taking leave from someone.

Example Sentence 1: After a long conversation, the elderly couple waved their hands and said their goodbyes.

Example Sentence 2: As the train pulled away from the platform, he shouted a last goodbye to his friends.

Example Sentence 3: With tears in her eyes, she gave her puppy a tender goodbye before leaving on her trip.

Sense 2:

(interjection) An expression used to express good wishes or bid farewell.

Example Sentence 1: "Goodbye, my friend! Have a safe journey!" he cried as his friend boarded the plane.

Example Sentence 2: She said a heartfelt goodbye to her colleagues as she left the office on her last day of work.

Example Sentence 3: "Goodbye, summer! Hello, autumn!" she exclaimed, excited for the changing seasons.