chaperone

1 noun
     
chap‧e‧rone1 , chaperon [countable]
1 an older woman in the past who went out with a young unmarried woman on social occasions and was responsible for her behaviour
2 American English someone, usually a parent or teacher, who is responsible for young people on social occasions:
Three parents went on the school ski trip as chaperones.

Dictionary results for "chaperone"
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