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 to emphasize that attention is paid to the individuals who complain or cause problems
Sometimes, you shouldn't be so quiet because the squeaky wheel gets the grease.