a waterproof jacket, typically with a hood, of a kind originally used in polar regions (原为极地用的)防水带兜帽夹克 ■(Brit. informal, derogatory)a socially inept and studious or obsessive person with unfashionable and largely solitary interests (英, 非正式, 贬)呆子
语源
1920s: from Greenland Eskimo anoraq. The British English informal sense dates from the 1980s and derives from the anoraks worn by trainspotters, regarded as typifying this kind of person