I. chap ‧ e ‧ rone 1 BrE AmE , chaperon /ˈʃæpərəʊn $ -roʊn/ noun [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.
II. chaperone 2 BrE AmE , chaperon verb [transitive]
to go somewhere with someone as a chaperone