Oxford Dictionary English yellow card nounnoun BrE BrE//ˌjeləʊ ˈkɑːd// ; NAmE NAmE//ˌjeloʊ ˈkɑːrd// Soccer Add to my wordlistjump to other results(in football (soccer )) a card shown by the referee to a player as a warning about bad behaviour compare red card See related entries: SoccerSee yellow card in the Oxford Advanced American DictionaryCheck pronunciation: yellow card oxfordlearnersdictionaries.com