erstwhile
adjective/ˈɜːstwaɪl/
/ˈɜːrstwaɪl/
[only before noun] (formal)- 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.
Oxford Collocations DictionaryErstwhile is used with these nouns:- ally
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erstwhile