bouncer (n.)

1762年，“弹跳者”，是从 bounce（v.）派生出来的代词，最初的意思是“猛击，打击”。19世纪有各种具体的意义，例如“吹牛，恃强凌弱的人”（1833年）； 还有“同类中的大例子”（1842年）； “酒吧或酒馆中的秩序执行者”（1865年，美国英语，最初是口语）。

Now it so happened that the brakeman was what is known, in the language of the road, as a "bouncer." That is, he was a hybrid combining the qualities of a brakeman and a bruiser, and was frequently called into requisition by the conductor to take the dirty work of ejecting tramps off of his hands. ["Staats," "A Tight Squeeze," 1879]

现在碰巧的是，车掌是所谓的“保镖”。也就是说，他是一种混合了车掌和打手的品种，经常被唤醒来处理驱逐流浪汉的脏活。【“斯塔茨”，“紧急情况”，1879年】

"The Bouncer" is merely the English "chucker out". When liberty verges on license and gaiety on wanton delirium, the Bouncer selects the gayest of the gay, and — bounces him! [London Daily News, July 26, 1883]

“保镖”只是英国的“驱逐者”。当自由趋于许可证，欢乐趋于放纵时，保镖会选择最快乐的人，然后把他们赶出去！【伦敦每日新闻，1883年7月26日】