Ring a ring o' rosesBritish English; Ring around the rosy American English
a children's singing game in which the children join hands and dance round in a circle singing: Ring a ring o'roses/A pocket full of posies/A-tishoo! A-tishoo!/We all fall down. People believe it comes from the time when there was aplague in London (=a very serious infectious disease, quickly causing death to large numbers of people), because when people coughed and sneezed, saying 'atishoo', it was a sign that they had caught the plague.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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