800 number
noun [ C ] uk/ˌeɪtˈhʌn.drəd ˌnʌm.bər/ us/ˌeɪtˈhʌn.drəd ˌnʌm.bɚ/
(美国的)800号码(公司企业或其他提供咨询或信息服务的机构开通的以800开头的免费电话号码)
in the US, a free phone number that begins with 800, provided by companies or other organizations offering advice or information