A phrase invoking God's protection to keep something from happening. Sometimes used sarcastically or hyperbolically. God forbid I get another ticket on my parents' car. I'll be grounded for a month! God forbid that an R-rated film should have anything offensive in it!
God forbid!and Heaven forbid!
a phrase expressing the desire that God would forbid the situation that the speaker has just mentioned from ever happening. Tom: It looks like taxes are going up again. Bob: God forbid! Bob: Bill was in a car wreck. I hope he wasn't hurt! Sue: God forbid!
See also: god