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
以前的；先前的；过去的；往昔的 - an erstwhile opponent
以前的对手 - His erstwhile friends turned against him.
他先前的朋友转而与他作对。
Collocations DictionaryErstwhile is used with these nouns:- ally
- an erstwhile opponent