heaven help (one)
A phrase used to acknowledge that one is in or could potentially be in trouble. If I have to go down the basement, which is full of spiders, heaven help me. Well, heaven help you if Mom finds out that you're the one who broke her vase. Heaven help us if she becomes our boss.
Heaven help us!
Fig. Good grief!; That's awful. He fell and broke his hip! Heaven help us! What's next?
God/Heaven ˈhelp somebody
(spoken) used to say that you are afraid somebody will be in danger or that something bad will happen to them: God help us if this doesn’t work.(Some people find this use offensive.)