0800 number - definition and synonyms

noun [countable] 

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/ˌəʊ eɪt ˈhʌndrəd ˌnʌmbə(r)/
singular0800 number
plural0800 numbers
  1. in the UK, a telephone number beginning with 0800 that is free to use and is usually for calling business services. The company you are calling pays for the call.