/ ˌrɪŋ ə rɪŋ ə ˈrəʊzɪz; NAmE ˈroʊzɪz/ noun
[ U ] a singing game played by children, in which the players hold hands and dance in a circle, falling down at the end of the song
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WORD ORIGIN
said to refer to the inflamed (“rose-coloured”) ring of buboes, symptomatic of the plague; the final part of the game is symbolic of death.