A friend of mine whose first language is not English still has some words and expressions that she hasn't quite assimilated.

For instance, the exclamation 'good gracious'. She knows about glaciers- this is Alaska, after all- so she hears it as Good Glacious!

Complaining about her son's thick-headedness she says that 'he is so stubbert.

I don't correct her- unless she says something that might be misconstrued. She once told me that she had to swing by the auto shop, that her mechanic had left a wrench 'in my behind'. I cautioned her that we say 'in the back seat'.