From Longman Dictionary of Contemporary Englishbannerban‧ner /ˈbænə $ -ər/●くろまる●くろまる○しろまる noun [countable]1EXPRESSa long piece of cloth on which something is written, often carried between two polesThe onlookers were shouting, cheering, and waving banners.2PPGBELIEVEa belief or principlecarry/raise/wave etc the banner of something (=publicly support a particular belief etc)She’d never felt the need to carry the banner of feminism.under the banner of somethingThey marched under the banner of equal educational opportunity.3 →under the banner of something4DSa flagExamples from the Corpusbanner• He was not a brave man, and often said so, brandishing his supposed nervousness like a banner.• A single protester attempted to unfurl a banner in the square on June 3, but was quickly arrested by police.• He is champion of the sceptics, and he sallies forth with his banners flying.• Would we please hang up our sponsorbanners so that we were not mistaken for refugees?• Gephardt is the most logical champion to lift that banner.• The protesters were carrying anti-war banners.• On their shelters were slogans flying on red and yellowbanners.carry/raise/wave etc the banner of something• In 1418, proclaiming himself the Prince of Pacification, Le Loi raised the banner ofrevolt.• Some of its leaders fear a revival of left-wing parties waving the banner of social justice.Originbanner(1200-1300)Old Frenchbanere