My 9 year old daughter has taken to saying this phrase around the house lately. She claims she heard it on a kids show. I’ve heard this phrase all my life and I’m aware that it’s considered a mild profanity, but how bad is it exactly? If she said it at school, would her French teacher gasp? What would be the English equivalent of it? I know it translates to “Sacred Blue” but what would be an equivalent phrase or curse in English? Oh Shit?