red flag
noun
1- a red flag as the symbol of socialist revolution or a warning of danger（象征社会主义革命或警告危险的）红旗。
1.1
the Red Flag
the anthem of Britain's Labour Party, a socialist song with words written in 1889 by James Connell (1852-1929) and sung to the tune of the German song 'O Tannenbaum'英国工党党歌（詹姆斯·康奈尔[1852-1929]1889年作词, 曲调取自德国歌曲《哦, 坦纳鲍姆》）。