the.com/chaperone

An adult whose job is to make sure nothing worth telling happens.

means A responsible older person who accompanies younger or unmarried people to supervise their behavior in social settings.

from From French chaperon, meaning 'hood' or 'hooded cloak' — the kind of head covering older women wore. By extension, a chaperon became a protective covering, and then, by the 18th century, a protective person: an older woman who covered or shielded a younger one's reputation by accompanying her in public.

origin
from chape, a hood hiding a hawk's eyes
original job
escort shielding a young woman's reputation
irony
the hood once hid things; now the person does
modern use
school trips, weddings, and awkward teen dates
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