I didn't know what "cleavage" meant. I had never heard the word until seventh grade. I figured it out pretty quickly, but before that I thought "showing cleavage" meant wearing pants so low that your butt crack showed.
A childhood belief about general

others believed things like this
- For years I heard the word "pedophile" and thought it meant a pedicurist's tool.— Lauren
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- I thought that the "don't walk" sign at crosswalks meant to run across the street as quickly as possible!— richard
- I used to believe that showing my bare arms meant that I was naked, so I never wore short sleeves as a kid. Anon
- I used to believe that "nuptial" was a naughty word. I thought it meant nipple. XD— Sara Hagen
- When I first heard the words "flea market", I actually thought it meant "selling fleas".Anon