When I was in preschool, if we couldn't go to an area it was "Off Limits." Me, not knowing the word "off" in that context, and not knowing what the word "limits" meant. I thought it was some German term, like Auflimetz, that mean "Don't Go Here"
A childhood belief about speaking

others believed things like this
- I used to think that an imbecile was some type of seal, before knowing that it meant someone stupid.Anon
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny
- I used to believe that "nuptial" was a naughty word. I thought it meant nipple. XD— Sara Hagen
- For years I heard the word "pedophile" and thought it meant a pedicurist's tool.— Lauren
- my husband believed, until recently, that the word "several" meant seven of something. — sheryl
- I used to think the word fever was just another word for giraff— Marshall m