Definition of erstwhile adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈɜːstwaɪl//
; NAmE NAmE//ˈɜːrstwaɪl//
[only before noun](formal)
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former; that until recently was the type of person or thing described but is not any more an erstwhile opponent His erstwhile friends turned against him.
See the Oxford Advanced American Dictionary entry: erstwhile