A newcomer or latecomer, especially a recent adherent to a cause or trend.
The definition of a Johnny-come-lately is a newcomer, or is someone who is late to accepting a position or late to arriving at an event.
A newcomer to an idea who is late in accepting what everyone else already believes to be true is an example of a Johnny-come-lately.
She might take offense if some Johnny-come-lately thinks he can do a better job.
(informal) One who is late or recent in arriving at a place, position, or viewpoint.
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