Chaperon (noun)

1. A person, usually an older person, who accompanies and supervises a young person, especially a woman, on social occasions.
2. A person who acts as a guardian or companion to a young person.

Origin:

Derived from the french word 'chaperon' meaning hood or cap, the term 'chaperon' has been in use since the 16th century.

Examples:

1. The young woman's mother acted as her chaperon for the ball.
2. The chaperon accompanied the students on their school trip to the museum.
3. The chaperon was responsible for making sure the young people at the dance behaved appropriately.
4. The chaperon helped the young woman find her seat at the concert.
5. The chaperon made sure the young men arrived safely at the hotel after the party.