1chap·er·one also chap·er·on 
/ˈʃæpəˌroʊn/ noun
plural chap·er·ones also chap·er·ons /ˈʃæpəˌroʊn/ noun [count] 1 US : someone (such as a teacher or parent) who goes with children on a trip or to a school dance to make sure that the children behave properly
▪ I was a chaperone on one of my son's school trips. 2 : a person in the past who went with a young unmarried woman to social events in order to make sure that the woman behaved properly
▪ I was a chaperone on one of my son's school trips.
