cleanse (v.)youdaoicibaDictYouDict[cleanse 词源字典]
Old English clænsian "to cleanse, purge, purify, chasten, justify," from West Germanic *klainson, from *klainoz (see clean (adj.)). Despite its modern spelling (16c.), it retains its Middle English pronunciation. Related: Cleansed; cleansing.[cleanse etymology, cleanse origin, 英语词源]
cleanser (n.)youdaoicibaDictYouDict
1520s, "a purgative;" 1560s, "one who cleans," agent noun from cleanse (v.). Meaning "thing that cleanses" is from late 14c. Old English had clænsere "priest."
cleansing (n.)youdaoicibaDictYouDict
Old English clænsunge "cleansing, purifying, castigation; chastity, purity," verbal noun from the root of cleanse. As a present participle adjective, attested from c. 1300.