A chaperone is literally a "hood" — the same root as cappuccino and chapel, all from a Late Latin hooded cloak that became a metaphor for protection.
A person who accompanies and supervises a younger person at social events to ensure propriety. Also used as a verb meaning to act as such a supervisor.
From French chaperon (hood, cape, protector), from chape (cloak, cape), from Late Latin cappa (hooded cloak). The metaphorical extension from protective hood to protective person developed in 18th-century French Key roots: cappa (Late Latin: "hooded cloak, cape"), chape (Old French: "cloak, cape").
A chaperone is literally a "hood" — from French chaperon, a protective head covering. The metaphor is beautiful: just as a hood shields the head from rain and cold, a chaperone shields a young person from social danger. The same Late Latin cappa (hooded cloak) gives us "cap," "cape," "chapel" (originally a shrine