unbias (v.)youdaoicibaDictYouDict[unbias 词源字典]
"to free from bias," 1708, from un- (2) "reverse, opposite of" + bias (v.).
The truest service a private man may hope to do his country is, by unbiassing his mind as much as possible. [Swift, "The Sentiments of a Church of England Man with respect to Religion and Government," 1708]
[unbias etymology, unbias origin, 英语词源]