Looking for the meaning or definition of the word come on down? Here's what it means.
Interjection
An invitation to someone in the upper part of a building to come downstairs.
An invitation to someone living to the north to come for a visit.
A catchphrase used on the television game show "The Price is Right", inviting a member of the audience to come to Contestant's Row to play the game. (Can we add an example for this sense?)