American English

Definition of Johnny-come-lately noun from the Oxford Advanced American Dictionary

 

Johnny-come-lately

 noun
noun
NAmE//ˌdʒɑni kʌm ˈleɪtli//
 
[singular] (disapproving or humorous)
 
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a person who has only recently arrived in a place or started an activity, especially someone who is more confident than they should be
See the Oxford Advanced Learner's Dictionary entry: Johnny-come-lately