chaperone
Concise Oxford English Dictionary © 2008 Oxford University Press:
chaperone /ˈʃapərəʊn/ (also chaperon /ˈʃapərɒn/)
▶noun a person who accompanies and looks after another person or group of people.
■ dated an older woman responsible for the decorous behaviour of a young unmarried girl at social occasions.
▶verb accompany and look after.– derivatives
chaperonage /ˈʃap(ə)r(ə)ˌnɪdʒ/ noun.
chaperonage /ˈʃap(ə)r(ə)ˌnɪdʒ/ noun.
– origin ME (denoting a hood or cap): from Fr., fem. of chaperon ‘hood’, dimin. of chape (see chape).
'chaperone' also found in these Oxford entries:

