Noun
Johnny-come-lately (plural Johnny-come-latelies or Johnnies-come-lately)
(idiomatic, also attributive) A newcomer; a novice; an upstart.
Synonyms: greenhorn, newcomer, novice; see also Thesaurus:newcomer, Thesaurus:beginner
She might take offense if some Johnny-come-lately thinks he can do a better job.
Biden's broader point is to push back on the idea that he's a Johnny-come-lately with the Black community or that his political connections there are owed only to being Obama's vice president. Source: Internet
But even without the fine print to undermine its sincerity, Linkin Park sounds like a Johnny-come-lately to an already overdone musical style. Source: Internet
"These Johnny-come-lately actors are rushing to the scene to save the day for Lafayette and Malacañang's flagship project." Source: Internet