At a school function, a chaperone is an adult who helps make sure the event goes smoothly, that the students don't get into trouble, etc. In movies set in the 1950s, their main function at school dances seems to be making sure no one puts booze in the punch and that the kids don't dance too close together. I have been on a few field trips with my children as a chaperone, which basically meant I made sure no one got lost.
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