A sum of money paid to a new employee as a benefit for being recruited by a company. He had such an impressive résumé that he was offered a sizeable golden hello for joining the company.
Please convey my good wishes to someone. (The someone can be a person's name or a pronoun. See also Give my best to someone; Remember me to someone.) Andy: Good-bye, Tom. Say hello to your brother for me. Tom: Sure. Bye, Andy. Sally: Well, good-bye. Mary: Bye. Sally: And say hello to Jane. Mary: Sure. Bye-bye.