a person who is sometimes very pleasant (Jekyll) and sometimes very unpleasant (Hyde) or who leads two very separate lives两重性格交替出现的人；具有善恶双重人格的人- He leads an almost Jekyll and Hyde existence—by day he’s an accountant, by night he’s a singer in a rock band.他领导着一个几乎杰基尔和海德的存在——白天他是会计，晚上他是摇滚乐队的歌手。
More Like This Expressions from literary sourcesExpressions from literary sources Word OriginFrom the story by Robert Louis Stevenson, Dr Jekyll and Mr Hyde, in which Dr Jekyll takes a drug which separates the good and bad sides of his personality into two characters. All the negative aspects go into the character of Mr Hyde.