God help (one) spoken language informal
Used when you want to warn someone that he or she will be in danger or that something bad will happen to them
God help us if this plan doesn’t succeed.
God help you if he finds out you lied to him.
To give someone information
I warned you in advance, especially about a negative consequence.
To warn someone that they are responsible for their actions, plans.
Used to allude that the last force, problem or burden which is seemingly minor and small causes a person, system or organisation to collapse or fail
Her husband's violent act last night was the straw that broke the donkey's back and she left him