A newcomer or late arrival to a group or activity. The rest of the staff wasn't too fond of Greg, a Johnny-come-lately who received praise from the manager after just one week on the job.Hurry up, Johnny-come-lately, we've already started today's drills!
Johnny-come-lately
A newcomer, as in She may be a Johnny-come-lately on the board, but she's doing a fine job with publicity. [1830s]