From Longman Dictionary of Contemporary Englishcolourscolours[plural] a) COLOUR/COLORthe colours that are used to represent a team, school, club, country etcclub/team/school colours a cap in the team colours Australia’s national colours are gold and green. b) British EnglishSUPPORT A PERSON, GROUP, OR PLANSUPPORT A TEAM OR PLAYER a flag, shirt etc that shows that someone or something belongs to or supports a particular team, school, club, or country → colour
Examples from the Corpus
national colours• The players themselves have no thoughts of flying any national colours. 