From Longman Dictionary of Contemporary Englishcolour supplementˈcolour ˌsupplement noun [countable] British English TCNa magazine printed in colour and given free with a newspaper, especially on Saturdays or Sundays
Examples from the Corpus
colour supplement• Monday On this particular Monday morning, Adrian had the feeling that he had woken up in a colour supplement.• A colour supplement had published one of her stories in a series by new authors.• Nobody could ever have thought that joining a cricket club was like opening a Sunday paper colour supplement.• Without you the Sunday Times colour supplement would come out black-and-white. 