Definition of Johnny-come-lately noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌdʒɒni kʌm ˈleɪtli//
; NAmE NAmE//ˌdʒɑːni 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 somebody who is more confident than they should be
See the Oxford Advanced American Dictionary entry: Johnny-come-lately